真题
1 . 如图,在△ABC中,D是BC边上的点(不与点B、C重合),连结AD.
问题引入:
(1)如图①,当点D是BC边上的中点时,S△ABD:S△ABC= ;当点D是BC边上任意一点时,S△ABD:S△ABC= (用图中已有线段表示).
探索研究:
(2)如图②,在△ABC中,O点是线段AD上一点(不与点A、D重合),连结BO、CO,试猜想S△BOC与S△ABC之比应该等于图中哪两条线段之比,并说明理由.
拓展应用:
(3)如图③,O是线段AD上一点(不与点A、D重合),连结BO并延长交AC于点F,连结CO并延长交AB于点E,试猜想
的值,并说明理由.
问题引入:
(1)如图①,当点D是BC边上的中点时,S△ABD:S△ABC= ;当点D是BC边上任意一点时,S△ABD:S△ABC= (用图中已有线段表示).
探索研究:
(2)如图②,在△ABC中,O点是线段AD上一点(不与点A、D重合),连结BO、CO,试猜想S△BOC与S△ABC之比应该等于图中哪两条线段之比,并说明理由.
拓展应用:
(3)如图③,O是线段AD上一点(不与点A、D重合),连结BO并延长交AC于点F,连结CO并延长交AB于点E,试猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9b80634440244a82f3f77ab4c48266a.png)
![](https://img.xkw.com/dksih/QBM/2014/7/31/1573743110291456/1573743116550144/STEM/6a389dea299d44c49351a0f313d651cb.png?resizew=435)
您最近一年使用:0次
2016-12-05更新
|
4646次组卷
|
11卷引用:安徽省桐城市黄岗中学2018届九年级上学期第二次月考数学试题2
安徽省桐城市黄岗中学2018届九年级上学期第二次月考数学试题22014年初中毕业升学考试(四川内江卷)数学2015年人教版初中数学九年级下册期中练习卷山东省东营市广饶县乐安中学2017届九年级上学期期中考试数学试题(已下线)【万唯原创】2015年河北省中考数学-试题研究-第二部分题型7(已下线)【万唯原创】2015年河南省中考数学试题研究专项-数学题型-第一部分题型7 专题2(已下线)【万唯原创】2015年河南省中考数学2014年真题-题型五(已下线)【万唯原创】2018年河南省中考数学红绿蓝-红卷-2018年易错题集训13(已下线)【万唯原创】2018年河南省中考数学红绿蓝-红卷-2018年16K不带密封线专题13(已下线)【万唯原创】与动点有关的探究·满分特训(一)(已下线)(专题)相似三角形的常见辅助线
2 . 如图(1),E是菱形
边
上一点,
是等腰三角形,AE=EF,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce468e13528f3406d7ebb42cb7dae37e.png)
,
交
于点G,探究
与α的数量关系.
时,在
上截取
,连接
,构造全等三角形,可求出
的大小,那么
______
;
(2)如图(1),求
与α的数量关系.
(3)如图(3),当
时,过A作
垂足为P,若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce468e13528f3406d7ebb42cb7dae37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70c8b267e7a141d0878f374ba6d8b94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2edcf11b341e3a4e2fdddb53648b36b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ac762a2899a58faa0d3ab44f1281fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9886db1aa7ae853e01a056711506b4ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52e89bcda280422e4adae1ea85678dc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2edcf11b341e3a4e2fdddb53648b36b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30fd47b6629b1e55494e4fad1ce5648f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(2)如图(1),求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2edcf11b341e3a4e2fdddb53648b36b4.png)
(3)如图(3),当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d03f73bec20b60bc7608972607f5a9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4710f75c66f19825a3e44b48f78bbac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/046cbf69d44e71676f11e13f0f767251.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68f1e72cbc30ad5fca807664692ea30b.png)
您最近一年使用:0次
3 . 如图,为探究一类矩形
的性质,小明在
边上取一点
,连接
,经探究发现:当
平分
时,将
沿
折叠至
,点
恰好落在
上,据此解决下列问题:
;
(2)如图,延长
交
于点
,交
于点
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dad1cae7f7af42986c74d251d0dc0f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891edc84cb2b12a0d730c07c2b2c1f9c.png)
(2)如图,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49ee1ac63438539d97735c764ec60a63.png)
您最近一年使用:0次
2024-03-30更新
|
266次组卷
|
6卷引用:2024年安徽省黄山市中考一模数学试题
2024年安徽省黄山市中考一模数学试题(已下线)热点08 图形的变化 (2大考向7种题型+重难通关练+培优争分练)-2024年中考数学【热点·重点·难点】专练(安徽专版)2024年安徽省徐州市第七中学中考二模数学试题2024年山东省青岛市部分学校中考一模数学模拟试题(已下线)重难点05 几何压轴综合(8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)(已下线)热点07 平行(特殊)四边形(8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(广东专用)
4 . 在学习“旋转”这一重要的平面图形变换时,李老师设计如下的一个问题,让同学们进行探究.如图1,在
中,
,
,点D是边
上一点,
,过点D作
交
于点E,将
绕点A逆时针方向旋转
.
旋转至如图2的位置时,连接
、
.求证:
;
(2)若将
旋转至B、D、E三点在同一条直线上时,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2202ac632ed851e9855fc8df6d7dd75f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/032c936934af07010d1102ed145cda48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/529fd856fc6b3f6ad1cede631cf97b93.png)
(2)若将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
您最近一年使用:0次
解题方法
5 . 如图1,矩形ABCD中,
.
【数学活动】
将矩形纸片
进行以下操作:
第一步:将矩形纸片
沿直线
对折,使点
与点
重合,然后展开铺平,得到折痕
,再将矩形纸片
沿对角线
对折,得到折痕AC,再次展开铺平,两折痕
与
交于点G;
第二步:将
绕点
逆时针旋转得到
,点F,
的对应点分别为点H,K,直线
与边
所在直线交于点
(点
不与点
重合),与边
所在直线交于点
.
(1)
绕点
旋转至图1的位置时,试判断
与
的数是关系,并证明你的结论.
【数学探究】
(2)①如图2,当直线
时,求
的长;
②在旋转过程中,当点K,H,C三点共线时,求
的长;
【问题延伸】
(3)在
绕点
旋转的过程中,连接
,则
的取值范围是______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92f1844834ef0315a704d8e2fba77544.png)
【数学活动】
将矩形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
第一步:将矩形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.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/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
第二步:将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3426ea75a5eaf8031e5af9d369d76014.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd9c0a25b09520b84f0029820998bc36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8c8034aef9ecb15c709331282b96eeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd9c0a25b09520b84f0029820998bc36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83042953e7f15e984b2da2ee9ca678d1.png)
【数学探究】
(2)①如图2,当直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8965dc9bb7991b880a1646c47af40bd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
②在旋转过程中,当点K,H,C三点共线时,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
【问题延伸】
(3)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c4750875c2116879747e9d35178db1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
您最近一年使用:0次
6 . 如图1,点
在正方形
的对角线
上,
,垂足为
,垂足为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/5/7f47323c-84ca-4659-b225-7bb2c7829ba3.png?resizew=438)
(1)求证:四边形
是正方形.
(2)如图2,将正方形
绕点
顺时针方向旋转
,试探究线段
与
之间的数量关系,并说明理由.
(3)如图3,正方形
在旋转过程中,当
三点在同一条直线上时,延长
交
于点
,若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0ddc47cce2e80eefc150192061c3b70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f37632add76883bd08b68c1b5099d7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/5/7f47323c-84ca-4659-b225-7bb2c7829ba3.png?resizew=438)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/920ae90193d50ae60beafae6f2b4ebcd.png)
(2)如图2,将正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/920ae90193d50ae60beafae6f2b4ebcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec18b43a3d835d6da87689949670d70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
(3)如图3,正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/920ae90193d50ae60beafae6f2b4ebcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ca382790c69e17b81574b8c2ac2f99d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f8833693501417d10d7d5150b19db4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
您最近一年使用:0次
7 . 在数学探究活动中,某同学进行了如下操作:如图,在直角三角形纸片
内剪取一个直角
,点
,
,
分别在
,
,
边上.请完成如下探究:
(1)当
为
的中点时,若
,
__________________
(2)当
,
、
时 ,
的长为 ___________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d63e1ee5400b102154210648ab93a135.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a24f5c132949a6d4600c7f0bac988113.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45a9896ee8415feccf06721dafc891b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bf479d1bca168025cc066206f89c205.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edd0c00f62c22e90e7d542a2f8dd83d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bc9f0779b0ba2f9f97caf35c166ad24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e48f8356121ca080b4189367143372b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
您最近一年使用:0次
8 . 综合与探究
如图,抛物线
与x轴相交于A,B两点,与y轴相交于点C,点B的坐标是
,点C的坐标是
,M是抛物线的顶点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/19/bef50d33-2808-4a09-a506-86830ac597e7.png?resizew=200)
(1)求抛物线的解析式.
(2)P为线段
上的一个动点,过点P作
轴于点D,D点坐标为
,
的面积为S.
①求
的面积S的最大值.
②在
上是否存在点P,使
为直角三角形?如果存在,请直接写出点P的坐标;如果不存在,请说明理由.
如图,抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f33189133d284c9d56d2c1d859ec50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb937e743d4e859ce608bfba979fce35.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/19/bef50d33-2808-4a09-a506-86830ac597e7.png?resizew=200)
(1)求抛物线的解析式.
(2)P为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5c62f22d7afc5627fcb86599faa8e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f00d0ff8dd38da17167cf9b789eec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3726021850f5b937bf61783869b4d68e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/177678001b2ccde1db8f57fa5e017002.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/177678001b2ccde1db8f57fa5e017002.png)
②在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5c62f22d7afc5627fcb86599faa8e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/177678001b2ccde1db8f57fa5e017002.png)
您最近一年使用:0次
2024-02-17更新
|
160次组卷
|
4卷引用:安徽省滁州市天长市实验中学教育集团2023-2024学年九年级下学期月考数学试题
安徽省滁州市天长市实验中学教育集团2023-2024学年九年级下学期月考数学试题山东省济南市长清区2023-2024学年九年级上学期期末数学试题山东省东营市广饶县乐安街道乐安中学2023-2024学年九年级下学期3月月考数学试题(已下线)专题06 三角形(全等、相似)(2大易错点分析+19个易错点+易错题通关)-备战2024年中考数学考试易错题(江苏专用)
9 . 如图1,在矩形纸片
中,
,
,点
是
中点,将这张纸片依次折叠两次;第一次折叠纸片使点
与点
重合,如图
,折痕为
,连接
、
;第二次折叠纸片使点
与点
重合,如图
,点
落到
处,折痕为
,连接
.完成下面的探究:
的长是______ ;
(2)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc1aa9064cef43c0f2c179673fe8f39.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/575bf0ff60cb0afcb26a504a9078c028.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a665df324c530f22911ebfc3cb300ec2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa29fe6cd9eb51c184f6299d437375cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3e298b2c864876f01b8674f5137484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07a85a76f4481aaf65ef97c490e3a152.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db2b52fbf3015f78f9fc9047be17ea18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0989ab6363e37ecee4565ded7891fc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ef9d0784478511736255074b9395fae.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc1aa9064cef43c0f2c179673fe8f39.png)
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10 . 在
中,
为
边上一动点,且
交
边于点
.探究:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/5/ef995393-a00d-4aac-9054-a7f0a8e8ec61.png?resizew=471)
(1)如图1,若
,当
时,求
的长.
延伸:如图2,若
为
上一点,且
.
(2)小东经过研究发现:“当点
在
边上运动时,
的长度不变,是个定值.”你认为小东的结论是否正确,如果正确,请求出这个定值;如不正确,说明理由.
(3)若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c40185b336f1b35b51600d41e32b5799.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/783520aed065d0e739959f650d86979d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/5/ef995393-a00d-4aac-9054-a7f0a8e8ec61.png?resizew=471)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eee462ac8bfd858845cccd21ab3c55f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
延伸:如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78aff56bf31acb938cdda341c199b3b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6618b4d41917e695da2356c016242ba4.png)
(2)小东经过研究发现:“当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee7cc5c75476896a599093f5ac10b97d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e7a71b30063e929dfcb71ae1693149e.png)
您最近一年使用:0次