1 . 【问题背景】在复习角平分线性质的时候,聪明的琪琪同学发现关于三角形角平分线的一个结论:如图①,已知
是三角形
的角平分线,可以得到
.琪琪同学的证明思路是这样的:如图②,过点
作
,交
的延长线于点
,构造相似三角形可以证明
.
【尝试证明】请你参照琪琪同学的思路,利用图②证明该结论;
【知识迁移】利用以上结论进行计算:若在图①中,
,
,
,则
______;
【应用拓展】如图③,已知在
中,
,
,
,
,求
的长.(直接写出结果)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a02bad7fac070822f4c8b4f8b64bda72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28971fe3e3f9d3849400e98b46fc3ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a02bad7fac070822f4c8b4f8b64bda72.png)
【尝试证明】请你参照琪琪同学的思路,利用图②证明该结论;
【知识迁移】利用以上结论进行计算:若在图①中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/addb8e20db1fbb40f17dea52f951b907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b939af5ba06e279cce39396aaf0fae06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c978d92edf0c4c1ef8620c17df75d35e.png)
【应用拓展】如图③,已知在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7099026716ee1821dd7d9f157dc055f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e8487936a5bafd4c57e69eaa1c6e033.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/26/17ba1af3-15c1-4f9d-9312-82afd55986d4.png?resizew=437)
您最近一年使用:0次
2 . 问题背景】如图1,
中,
,
中,
,且
,求证:
;
【变式迁移】如图(2),
中,
,
,点D为
内一点,将点A绕点D顺时针旋转
得到
,连接
,求
的值;
【拓展创新】如图(3),
中,
,
,点D为
外一点,
,连接CD,求线段
之间的数量关系.(用含
的式子表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8abfdaab699cfe51bb9678110ad6aee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/421291381be28da4bd16560fd383b4a9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/26/afdaa842-742a-4846-94c9-e0395d722b9e.png?resizew=150)
【变式迁移】如图(2),
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7a0387fc1258f31e44a10068c0ccfd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29feb1637b8a4540c7aec5287cb7b235.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4827c0d1f3c08cf4f84fae65615d8ec0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/26/21f99858-4d51-4969-b165-dbd344e3444c.png?resizew=149)
【拓展创新】如图(3),
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/597ce705d3a2fe04d29de9e81ec6250d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/650c6c818df102a83ce5159e3208d01a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07e4c964637944e40857bc2297f03712.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/26/4ef8166f-e506-4fed-bbc6-f8a7cee10079.png?resizew=165)
您最近一年使用:0次
2023-06-13更新
|
286次组卷
|
3卷引用:2023年河北省中考数学真题变式题21-26题
3 . 【方法尝试】如图1,矩形
是矩形
以点A为旋转中心,按逆时针方向旋转
所得的图形,
分别是它们的对角线.求证:
.
【类比迁移】如图2,在
和
中,
,
,
,
,
.将
绕点
在平面内逆时针旋转,设旋转角
为
,连接
,
.
①请判断线段
和
的数量关系和位置关系,并说明理由;
②当点B,D,E在同一直线上时,求线段
的长.
【拓展延伸】如图3,在
中,
,
,过点
作
,在射线
上取一点
,连接
,使得
,请直接写出线段
的最值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/11/a7ff7be5-2400-42ff-894a-9024db929838.png?resizew=359)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcca8b9ba7a9fdd7d18ce9c1e86d2cd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50cfd99a702ee24f9ef94e4b6f50101f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f84c6849f9bc557a5909774392a1650.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0815859de2944a0a49b5f060665c8b7c.png)
【类比迁移】如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40e7ba6e267dde1a65a98f9f36b585ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26813466e2ee49a493881a4384fc8748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a7e3a943e5bf040d783c12d67e6a258.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba56b41fe702d9b6433e4d01e48d69a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6166b9a5437671bcba31e17c375eb39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63b43490ca09467a4c8cd8cfe91c94e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060705794ef87cc71dac40c57f27b1d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6f3e30221f5372d1b9fac7d1f369418.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
①请判断线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
②当点B,D,E在同一直线上时,求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
【拓展延伸】如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2978b8d837699bbbdf4776d71dbd673e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6572c76b9bf519fb3a8ef27ec8a7a73a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/11/a7ff7be5-2400-42ff-894a-9024db929838.png?resizew=359)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/11/f8d6041a-ac2a-4779-ac9d-86d6c6a90598.png?resizew=457)
您最近一年使用:0次
2023-04-03更新
|
236次组卷
|
2卷引用:2023年河北省衡水市阜城县崔庙镇初级中学中考适应性数学试题
真题
4 . 【建立模型】(1)如图
,点
是线段
上的一点,
,
,
,垂足分别为
,
,
,
.求证:
;
【类比迁移】(2)如图
,一次函数
的图象与
轴交于点
、与
轴交于点
,将线段
绕点
逆时针旋转
得到
、直线
交
轴于点
.
①求点
的坐标;
②求直线
的解析式;
【拓展延伸】(3)如图
,抛物线
与
轴交于
,
两点
点
在点
的左侧
,与
轴交于
点,已知点
,
,连接
.抛物线上是否存在点
,使得
,若存在,求出点
的横坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf4dc4d7d30af1cdce660795e0fd7d7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5daa413c5a1b941452121c5d750a03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3d2d3643a9579f2c693ef86909441e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0e3e353c4f5fb556b4609a18a903d3d.png)
【类比迁移】(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1d7df623642896d720d6956ed1f0ff6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7a0387fc1258f31e44a10068c0ccfd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
①求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
②求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
【拓展延伸】(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b73ec2e51e8bf082ec95b5ce8348de68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d00a7d09a280afbeae6b739f88bc472c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27a56bf5d9ae47f805017541f5cabd9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15bdee7807edba89958c84bf4bb85f15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/114420d33bb74a43155a9ea85679527c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
您最近一年使用:0次
2023-06-19更新
|
2362次组卷
|
10卷引用:2024年河北省邯郸市育华中学中考一模数学试题
2024年河北省邯郸市育华中学中考一模数学试题河北省邯郸市育华中学中学2023-2024学年九年级下学期第一次月考数学试题2023年新疆维吾尔族自治区中考数学真题 (已下线)专题08 二次函数图象性质与综合应用(44题)-学易金卷:2023年中考数学真题分项汇编(全国通用)(已下线)专题12 三角形综合问题-学易金卷:5年(2019-2023)中考1年模拟数学真题分项汇编(全国通用)(已下线)专题32 函数与几何综合问题(共25题)-学易金卷:2023年中考数学真题分项汇编(全国通用)(已下线)2023年新疆维吾尔族自治区中考数学真题变式题20-23题(已下线)突破06 函数与几何图形动态探究题(5类重点考向)-备战2024年中考数学真题题源解密(全国通用)(已下线)重难点04 二次函数综合(7大题型+满分技巧+限时分层检测)-2024年中考数学【热点·重点·难点】专练(上海专用)2024年山东省菏泽市巨野县九年级中考一模数学试题
11-12八年级上·江苏无锡·期中
名校
5 . 数学课上,李老师出示了如下的题目.
在等边三角形
中,点
在
上,点
在
的延长线上,且
,如图.试确定线段
与
的大小关系,并说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/bf1f447f-d767-4af9-986a-c1b522c86826.png?resizew=218)
小敏与同桌小聪讨论后,进行了如下解答:
(1)特殊情况,探索结论.
当点
为
的中点时,如图
,确定线段
与的
大小关系.请你直接写出结论:
____
(填“
”,“
”或“
”).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/3c504148-b615-4197-8adc-006316c0db46.png?resizew=216)
(2)特例启发,解答题目.
解:题目中,
与
的大小关系是:
________
(填“
”,“
”或“
”).理由如下:
如图
,过点
作
,交
于点
.(请你完成以下解答过程)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/7986410a-7b8e-4902-a5da-52a210aa92d9.png?resizew=197)
(3)拓展结论,设计新题.
在等边三角形
中,点
在直线
上,点
在直线
上,且
.若
的边长为
,
,求
的长(请你直接写出结果).
在等边三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62f9a3935cd124d021c7b18b0f634915.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/bf1f447f-d767-4af9-986a-c1b522c86826.png?resizew=218)
小敏与同桌小聪讨论后,进行了如下解答:
(1)特殊情况,探索结论.
当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392cdb9d30684cce244bef94b8d861b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff7942da6c3fc4005256fb1458557c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/3c504148-b615-4197-8adc-006316c0db46.png?resizew=216)
(2)特例启发,解答题目.
解:题目中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392cdb9d30684cce244bef94b8d861b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff7942da6c3fc4005256fb1458557c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee73452ee4d5437f1399f1235b95e55f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/8/7986410a-7b8e-4902-a5da-52a210aa92d9.png?resizew=197)
(3)拓展结论,设计新题.
在等边三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62f9a3935cd124d021c7b18b0f634915.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b0393ce62b24aa5f9b740d4cc6743b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
您最近一年使用:0次
2022-12-02更新
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155次组卷
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50卷引用:河北省保定市唐县2018-2019学年八年级上学期期末数学试题
河北省保定市唐县2018-2019学年八年级上学期期末数学试题(已下线)【万唯原创】2014年河北省中考数学-面对面-热点题型攻略 题型7+8河北省石家庄市辛集市2021-2022学年八年级上学期期末数学试题 河北省保定市安新县2022-2023学年八年级上学期期末考试数学试题(已下线)2011年江苏省江阴市青阳二中八年级上学期期中考试数学卷(已下线)2011-2012年江苏省南通市幸福中学八年级上学期期中考试数学卷(已下线)浙江省衢州市实验学校2011-2012学年八年级上学期期末考试数学卷(已下线)2011-2012学年浙江省台州市八校八年级上学期期中联考数学试卷(已下线)2011-2012学年浙江慈溪市四校八年级下学期期中联考数学卷2012-2013学年吉林镇赉镇赉镇中学九年级下第一次综合测试数学试卷2014-2015学年江苏省泰州市海陵区八年级上学期期中考试数学试卷2014-2015学年江苏省江阴市第二中学八年级上学期期中考试数学试卷2014-2015学年云南省腾冲县八年级上学期六校联考期末数学试卷2014-2015学年四川省自贡赵化中学八年级上学期第三次段考数学试卷2015-2016学年浙江省杭州四季青中学八年级上学期期中考试数学试卷江苏省扬州中学教育集团树人学校2017-2018学年八年级上学期第一次月考数学试题山东省济南市历下区2016-2017学年八年级下学期期中考试数学试卷广东省汕头市龙湖区2017-2018学年八年级上学期期末质量检测数学试题【市级联考】黑龙江省鸡西市2018-2019学年八年级(上)期末数学试卷江苏省南京市第一中学2019-2020学年八年级上学期期中数学试题江西省赣州市宁都县2019-2020学年八年级上学期期中数学试题江西省赣州市宁都县实验班2019-2020学年八年级上学期期末数学试题江西省赣州市寻乌县2018-2019学年八年级上学期期末数学试题北师大版八年级下第一章 三角形的证明 第一节 等腰三角形江西省寻乌县澄江中学2018-2019学年八年级上学期期末数学试题2020年江苏省宝应县九年级下学期数学一模试题北师大版2019-2020学年七年级下册第5章 生活中的轴对称单元测试(B卷提升卷)数学试题四川省渠县崇德实验学校2019-2020学年八年级下学期第一次月考数学试题(已下线)【万唯原创】2014年河南省中考数学-面对面-第二部分题型5(已下线)【万唯原创】2016年河南省中考数学-面对面河南数学-第二部分题型7江苏启东惠萍初中2020--2021学年八年级上数学调研试题(已下线)【南昌新东方】2020年7月九江同文中学初二下期末考试 13浙江省嘉兴市秀洲区三校共同体2020-2021学年八年级上学期月考数学试题(一)(已下线)【万唯原创】2021年河南试题研究-第二部分题型6重庆市垫江第八中学2021-2022学年八年级上学期第一次定时练习数学试题重庆市垫江县垫江第八中学校2021-2022学年八年级上学期第一次月考数学试题江苏省淮安市清江浦区淮阴中学开明分校2021-2022学年八年级上学期9月月考数学试题(已下线)八年级上学期期中【易错60题考点专练】-2022-2023学年八年级数学上学期考试满分全攻略(人教版)(已下线)13.3 等腰三角形 13.4 最短路径问题-2022-2023学年八年级数学上册课后培优分级练(人教版)(已下线)第13章 轴对称(基础、常考、易错、压轴)分类专项训练-2022-2023学年八年级数学考试满分全攻略(人教版)广东省梅州市丰顺县大龙华学校2022-2023学年九年级上学期数学9月月考数学试题广东省梅州市丰顺县东留中学2022-2023学年九年级上学期12月月考数学试题(已下线)八年级上学期期末【易错60题考点专练】-2022-2023学年八年级数学上学期考试满分全攻略(人教版)(已下线)河南省郑州市登封市告成镇初级中学2021-2022学年八年级下学期第一次月考数学试题河南省郑州市登封市告成一中2022-2023学年下学期八年级第一次月考数学试卷辽宁省丹东市凤城市2022-2023学年八年级下学期期中数学试题江西省抚州市第一中学2022-2023学年八年级下学期月考数学试题13.3.2 等边三角形黑龙江省齐齐哈尔市五地市2023-2024学年八年级上学期期中数学试题江苏省苏州市苏州工业园区青剑湖实验中学2023-2024学年八年级上学期10月月考数学试题
6 . 【问题提出】
如图1,
与直线
相离,过圆心
作直线
的垂线,垂足为
,且交
于
、
两点(
在
、
之间).我们把点
称为
关于直线
的“远点”,把
的值称为
关于直线
的“远望数”.
中,点
的坐标为
,过点
画垂直于
轴的直线
,则半径为1的
关于直线
的“远点”坐标是______,直线
向下平移______个单位长度后与
相切.
(2)在(1)的条件下求
关于直线
的“远望数”.
【拓展应用】
(3)如图3,在平面直角坐标系
中,直线
经过点
,与
轴交于点
,点
坐标为
,以
为圆心,
为半径作
.若
与直线
相离,
是
关于直线
的“远点”.且
关于直线
的“远望数”是
,求直线
的函数表达式.
如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1aa118a9a7c2a6ab4aef90d61598256e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed1a65d88f9823d49da8f3b96ea9ec6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)在(1)的条件下求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
【拓展应用】
(3)如图3,在平面直角坐标系
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e0f0000389d49a88b8df439c5b8bc86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5265d99095b635f62c7915298ec0e963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/989dc4af481c6133824200942b9e5c8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/989dc4af481c6133824200942b9e5c8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/989dc4af481c6133824200942b9e5c8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/989dc4af481c6133824200942b9e5c8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a897d98bb96fc3ba99afeb09830f20c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
您最近一年使用:0次
2022-05-29更新
|
112次组卷
|
2卷引用:2022年河北省保定市清苑区中考二模数学试题
7 . 两个完全相同的直角三角板按如图1所示方式放置,
,直角顶点
和
重合,
,连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/14/e10548b5-deb2-4341-8211-880fc44cdae2.png?resizew=882)
(1)论证:求证:
.
(2)探索:如图2,
、
为两个三角板斜边上的两动点,且
,
,当
最小时,求
的长.
(3)拓展:将两个三角板按图3所示方式放置,直角顶点
在
上,两三角板的直角边分别交于
、
两点,当
与
相似时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a3122d2d314bee5d76b12ec47c7458.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/14/e10548b5-deb2-4341-8211-880fc44cdae2.png?resizew=882)
(1)论证:求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/245beea4af296f10767e939ce4971d2e.png)
(2)探索:如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06d87d88e2022bdb4996a9e36edd7dc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae8bc7651978b08f072ebb191eb41190.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
(3)拓展:将两个三角板按图3所示方式放置,直角顶点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/129f1d6567bef09b00b7f37894e6dba7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
您最近一年使用:0次
8 . 【基础巩固】
(1)如图1,△ABC∽△ADE,求证:△ABD∽△ACE;
【尝试应用】
(2)如图2,在平行四边形ABCD中,点E,F分别在BC,AC上,△AEF∽△ACD,BE=2,CE=6,求AF•AC的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/20/038c0dd9-27ff-43a4-ba83-e5201992049d.png?resizew=515)
【拓展提高】
(3)如图3,在(2)的条件下,连接DF,AB=AF,已知cos∠ACD=
,求tan∠ACB的值.
(1)如图1,△ABC∽△ADE,求证:△ABD∽△ACE;
【尝试应用】
(2)如图2,在平行四边形ABCD中,点E,F分别在BC,AC上,△AEF∽△ACD,BE=2,CE=6,求AF•AC的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/20/038c0dd9-27ff-43a4-ba83-e5201992049d.png?resizew=515)
【拓展提高】
(3)如图3,在(2)的条件下,连接DF,AB=AF,已知cos∠ACD=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
您最近一年使用:0次
2021-11-20更新
|
190次组卷
|
2卷引用:河北省邢台市信都区2021-2022学年九年级上学期期中数学试题
9 . 在一平面内,线段
,线段
,将这四条线段顺次首尾相接.把
固定,让
绕点
从
开始逆时针旋转角
到某一位置时,
,
将会跟随出现到相应的位置.
(1)论证 如图1,当
时,设
与
交于点
,求证:
;
(2)发现 当旋转角
时,
的度数可能是多少?
(3)尝试 取线段
的中点
,当点
与点
距离最大时,求点
到
的距离;
(4)拓展 ①如图2,设点
与
的距离为
,若
的平分线所在直线交
于点
,直接 写出
的长(用含
的式子表示);
②当点
在
下方,且
与
垂直时,直接 写出
的余弦值.
![](https://img.xkw.com/dksih/QBM/2021/6/22/2748574003732480/2748701406183424/STEM/f8762ea9-b75a-4f72-80fa-ad65e64d6e16.png)
![](https://img.xkw.com/dksih/QBM/2021/6/22/2748574003732480/2748701406183424/STEM/619f5124-73a7-4b2c-b85f-21cd184bb062.png?resizew=257)
![](https://img.xkw.com/dksih/QBM/2021/6/22/2748574003732480/2748701406183424/STEM/43740e80-558a-4537-abc8-02d387e723dc.png?resizew=227)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4630b9ca3d20635161fa8fbf812b9128.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0560a05e574a42ae68097a5a69b0a7d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d34e595767a4d8597b8d973af489a71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(1)论证 如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34e0a957a55460c72673c0f2ee90dbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/936fe43fddabaf910c0419a146372b37.png)
(2)发现 当旋转角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97cf714ffb3fd5917a76b191640b55fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
(3)尝试 取线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(4)拓展 ①如图2,设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
②当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/2021/6/22/2748574003732480/2748701406183424/STEM/f8762ea9-b75a-4f72-80fa-ad65e64d6e16.png)
![](https://img.xkw.com/dksih/QBM/2021/6/22/2748574003732480/2748701406183424/STEM/619f5124-73a7-4b2c-b85f-21cd184bb062.png?resizew=257)
![](https://img.xkw.com/dksih/QBM/2021/6/22/2748574003732480/2748701406183424/STEM/43740e80-558a-4537-abc8-02d387e723dc.png?resizew=227)
![](https://img.xkw.com/dksih/QBM/2021/6/22/2748574003732480/2748701406183424/STEM/9f177714-a13b-42dd-9a28-e401a92f6e32.png)
您最近一年使用:0次
真题
10 . 小波在复习时,遇到一个课本上的问题,温故后进行了操作、推理与拓展.
(1)温故:如图1,在△ABC中,AD⊥BC于点D,正方形PQMN的边QM在BC上,顶点P,N分别在AB,AC上,若BC=6,AD=4,求正方形 PQMN的边长.
(2)操作:能画出这类正方形吗?小波按数学家波利亚在《怎样解题》中的方法进行操作:如图2,任意画△ABC,在AB上任取一点P′,画正方形P′Q′M′N′,使Q′,M′在BC边上,N′在△ABC内,连结BN′并延长交AC于点N,画NM⊥BC于点M,NP⊥NM交AB于点P,PQ⊥BC于点Q,得到四边形PQMN.小波把线段BN称为“波利亚线”.
(3)推理:证明图2中的四边形PQMN是正方形.
(4)拓展:在(2)的条件下,于波利业线BN上截取NE=NM,连结EQ,EM(如图3).当tan∠NBM=
时,猜想∠QEM的度数,并尝试证明.
请帮助小波解决“温故”、“推理”、“拓展”中的问题.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/15/41811a5a-4fca-466a-a580-9cd828f241ea.png?resizew=178)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/15/ba037060-b67d-482f-ac34-9c5766af64cf.png?resizew=167)
(1)温故:如图1,在△ABC中,AD⊥BC于点D,正方形PQMN的边QM在BC上,顶点P,N分别在AB,AC上,若BC=6,AD=4,求正方形 PQMN的边长.
(2)操作:能画出这类正方形吗?小波按数学家波利亚在《怎样解题》中的方法进行操作:如图2,任意画△ABC,在AB上任取一点P′,画正方形P′Q′M′N′,使Q′,M′在BC边上,N′在△ABC内,连结BN′并延长交AC于点N,画NM⊥BC于点M,NP⊥NM交AB于点P,PQ⊥BC于点Q,得到四边形PQMN.小波把线段BN称为“波利亚线”.
(3)推理:证明图2中的四边形PQMN是正方形.
(4)拓展:在(2)的条件下,于波利业线BN上截取NE=NM,连结EQ,EM(如图3).当tan∠NBM=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
请帮助小波解决“温故”、“推理”、“拓展”中的问题.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/15/41811a5a-4fca-466a-a580-9cd828f241ea.png?resizew=178)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/15/ba037060-b67d-482f-ac34-9c5766af64cf.png?resizew=167)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/15/05c6a783-0b9c-4095-aa74-71191a0c099d.png?resizew=174)
您最近一年使用:0次
2019-06-19更新
|
1142次组卷
|
9卷引用:河北省沧州泊头市2019-2020学年九年级上学期期中数学试题