已知正方形
,
是对角线
上一点.
(1)如图1,连接
,
.求证:
;
(2)如图2,
是
延长线上一点,
交
于点
,
.判断
的形状并说明理由;
(3)在第(2)题的条件下,
.求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/18/b59c0c08-8980-4cb2-9d42-6aee8c2e12a3.png?resizew=342)
(1)如图1,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/778d3b35958e8139ab3bdf636cfc6f0e.png)
(2)如图2,
![](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/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fd8f551c92c15ad3bb09f9aa470496b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c4da8c9541c01c2fa51788ed30cd6a9.png)
(3)在第(2)题的条件下,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de93a4fa2069aed282b7a97a4b41afbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5f276ad76c075f4be32ad326d223cf3.png)
2023·内蒙古·中考真题 查看更多[6]
2023年内蒙古自治区呼伦贝尔市、兴安盟中考数学真题 (已下线)专题4.42 图形的相似(全章直通中考)(培优篇)-2023-2024学年九年级数学上册基础知识专项突破讲与练(北师大版)(已下线)专题4.54 相似三角形的性质与判定综合专题(分层练习)(培优练)-2023-2024学年九年级数学上册基础知识专项突破讲与练(北师大版)(已下线)专题16 相似三角形(考点回归+练透中考6类核心重点考向)-备战2024年中考数学真题题源解密(全国通用)(已下线)重难点02 相似三角形模型及其综合题综合训练(11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(全国通用)(已下线)专题04 四边形的证明与计算(全等、相似、边角计算)-2024年中考数学二轮热点题型归纳与变式演练(全国通用)
更新时间:2023-09-15 13:59:57
|
相似题推荐
解答题-证明题
|
较难
(0.4)
【推荐1】如图,在正方形
中,
,
是对角线
上的点,连接
,过点
作
交
于点
,连接
交
于点
.
(1)求证:
;
(2)求证:
;
(3)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f0805cc7a96c866df10b667ac4851e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/29/a5bf1a96-2c12-4310-9bf9-5b5dfb2f932a.png?resizew=88)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fe6d389a6c448d92b79d89bc9e8489f.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c796ebf5c1792a13a743d73528ea308.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0cee0f36dc452e58086832c0152b641.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
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真题
【推荐2】【感知】如图①,点A、B、P均在
上,
,则锐角
的大小为__________度.
是等边三角形
的外接圆,点P在
上(点P不与点A、C重合),连结
、
、
.求证:
.小明发现,延长
至点E,使
,连结
,通过证明
,可推得
是等边三角形,进而得证.
下面是小明的部分证明过程:
证明:延长
至点E,使
,连结
,
四边形
是
的内接四边形,
.
,
.
是等边三角形.
,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14e1bfec039b890526e0efea2389bd34.png)
请你补全余下的证明过程.
【应用】如图③,
是
的外接圆,
,点P在
上,且点P与点B在
的两侧,连结
、
、
.若
,则
的值为__________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ccc37b189fa2cbc269ca0b233dac37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ced5ba0c8666797d290cefca789c833.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e2cc1d4262a71046a0b378c250c3100.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d975ef1c9eba769000881aa91f01c243.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64eb31601464364be2baf4aa87404bcd.png)
下面是小明的部分证明过程:
证明:延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e2cc1d4262a71046a0b378c250c3100.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b027ed57b9c6f24e27ec0ae282c76efa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4061ff48ef8addf4deb4ec33d9b91a2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad86c204a804754fa5048e2bb7dfdf69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9634b211366e04babe0135297d4c75f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce8f76f6531524d4f34e30899dc492b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad23d2014068511177011a89fd51ccf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14e1bfec039b890526e0efea2389bd34.png)
请你补全余下的证明过程.
【应用】如图③,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c39473fd19e571bde4921cae19d9cc9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a8ab594619c400a652820a840c0247d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94aa8802e272b803bd99b485b4640fcc.png)
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解答题-证明题
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较难
(0.4)
【推荐3】数学活动课上,陈老师布置了这样一道题目.
如图1,已知两条平行的直线
、
及点
,用直尺和圆规作
,使得点
、
分别在直线
、
上,且满足
,
.
(1)如图2,嘉淇的方法如下:
①过点
作
,
与直线
、
分别交于点
、
;
②在直线
上截取点
,使
;
③在直线
上截取点
,使
;
④连接
、
、
,得到
.
请你证明嘉淇作出的
满足
,
.
(2)如图3,若将题目中“两条平行的直线
、
”改为“两条不平行的直线
、
”,其余条件不变,请你在图1中用直尺和圆规作出
,使得点
、
分别在直线
、
上,且满足
,
.(保留作图痕迹,不必写出做法)
如图1,已知两条平行的直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.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/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63e4d19bf237a6fca67e0d01a9ddb726.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f9b9bb0f509e6f3d30858efb217c1f5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/8/8709754e-55bc-434b-b37c-9bce5b555fd7.png?resizew=219)
(1)如图2,嘉淇的方法如下:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/8/acc53e96-c056-4c3c-b828-29d2ef4a94be.png?resizew=219)
①过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddbfba10a7622277b29b1d55908e13d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
②在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df9c150141a80b018fe77bfeeb82b6c.png)
③在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49d798dabf6548371d98a5b24252955b.png)
④连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
请你证明嘉淇作出的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63e4d19bf237a6fca67e0d01a9ddb726.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f9b9bb0f509e6f3d30858efb217c1f5.png)
(2)如图3,若将题目中“两条平行的直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.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/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63e4d19bf237a6fca67e0d01a9ddb726.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f9b9bb0f509e6f3d30858efb217c1f5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/8/b891c73e-2de7-4240-bdfa-f42e86c68ced.png?resizew=223)
您最近一年使用:0次
【推荐1】定义:把斜边重合,且直角顶点不重合的两个直角三角形叫做共边直角三角形.
![](https://img.xkw.com/dksih/QBM/2020/12/7/2608965911592960/2609119324676096/STEM/37e18c865ced43799cabe48ac241732a.png?resizew=554)
(1)概念理解:如图1,在
和
中,
,说明
和
是共边直角三角形.
(2)问题探究:如图2,
和
是共边直角三角形,E、F分别是
、
的中点,连结
,求证
.
(3)拓展延伸:如图3,
和
是共边直角三角形,且
,连结
,求证:
平分
.
![](https://img.xkw.com/dksih/QBM/2020/12/7/2608965911592960/2609119324676096/STEM/37e18c865ced43799cabe48ac241732a.png?resizew=554)
(1)概念理解:如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0005e1ef60f6ddc5f9a83e3de1ef3b2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e959122377e1a40aa359b9f7520c0d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0005e1ef60f6ddc5f9a83e3de1ef3b2e.png)
(2)问题探究:如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0005e1ef60f6ddc5f9a83e3de1ef3b2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab1a1fd2fc33e89f357cef772ff6cd0e.png)
(3)拓展延伸:如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0005e1ef60f6ddc5f9a83e3de1ef3b2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/532aece6cfd67e2a97977eed978dbf2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d9a49ebe74caaafab0145ccc5953382.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d9a49ebe74caaafab0145ccc5953382.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
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解答题-问答题
|
较难
(0.4)
【推荐2】如图,点
在正方形
的
边上(不与点
重合),连接
,将
沿
翻折,使点
落在点
处,作射线
交
于点
,交
于点
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/12/9bec4381-78fc-40d7-8145-64b36fe5ac73.png?resizew=136)
(1)求证:
.
(2)过点
作
交射线
于点
.
①求
的度数;
②直接写出线段
与
之间的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65436512ecbaefba4ac8123c55094211.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2689f0ce5ab3467d8214794d8acb2bd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/12/9bec4381-78fc-40d7-8145-64b36fe5ac73.png?resizew=136)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5bb5071335aefb946a41eaac65dd88.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb9f6cdf013e7ad7ed16d3f1e5f221ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb73f5d39d64c5ee81cf86bdd2ed98e8.png)
②直接写出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2273ae1ee99cec9c1304323bc9ebf75f.png)
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解答题-证明题
|
较难
(0.4)
【推荐1】已知正方形
,等腰直角三角板的一个锐角顶点与
重合,将此三角板绕
点旋转时,两边分别交直线
、
于
、
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/d9b73854-fe66-4f72-97c4-5ce10d319fd8.png?resizew=398)
(1)正方形的内角和是 °,
°;
(2)当
、
分别在边
、
上时(如图1),求证:
;
(3)当
、
分别在边
、
所在的直线上时(如图2),线段
、
、
之间又有怎样的数量关系,请直接写出结论 ;(不用证明)
(4)当
、
分别在边
、
所在的直线上时(如图3),线段
、
、
之间又有怎样的数量关系,请写出结论并写出证明过程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/d9b73854-fe66-4f72-97c4-5ce10d319fd8.png?resizew=398)
(1)正方形的内角和是 °,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aa9879b33becfb45396c85a84576871.png)
(2)当
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2519c65ca5090d8cd448cab633ea1a1b.png)
(3)当
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
(4)当
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
名校
【推荐2】正方形ABCD中,点O是对角线DB的中点,点P是DB所在直线上的一个动点,PE⊥BC于E,PF⊥DC于F.
(1)当点P与点O重合时(如图①),猜测AP与EF的数量关系,并证明你的结论;
(2)当点P在线段DB上(不与点D、O、B重合)时(如图②),探究(1)中的结论是否成立?若成立,写出证明过程;若不成立,请说明理由;
(3)当点P在DB的长延长线上时,请将图③补充完整,并判断(1)中的结论是否成立?若成立,直接写出结论;若不成立,请写出相应的结论.
(1)当点P与点O重合时(如图①),猜测AP与EF的数量关系,并证明你的结论;
(2)当点P在线段DB上(不与点D、O、B重合)时(如图②),探究(1)中的结论是否成立?若成立,写出证明过程;若不成立,请说明理由;
(3)当点P在DB的长延长线上时,请将图③补充完整,并判断(1)中的结论是否成立?若成立,直接写出结论;若不成立,请写出相应的结论.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/23/e6b87381-8dcf-4295-8122-49470778178a.png?resizew=439)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐1】如图三角形ABC中,中线AD,BE交于点F,EG // BC,交AD于点G.
(1)求
的值
(2)如果BD=2
,DF=2,请找出于△BDA相似的三角形,并挑出一个进行证明.
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/439d3adaf84ca01ccecbedc527f8dd34.png)
(2)如果BD=2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/2020/1/11/2374958046109696/2375556106747904/STEM/42b4e4f5a93c4845a1b593dd86bfaa06.png?resizew=183)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】在等腰直角
中,
,点D为射线
上一动点(点D不与点B、C重合),以
为腰且在
的右侧作等腰直角
,
,射线
与射线
交于点E,联结
.
上时,
①求证:
;
②设
,求y关于x的函数解析式,并写出x的取值范围;
(2)当
时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df630c436b3c3cd166c0de033acdbb0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/441dec590b47adc3678a291a3ec89a4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb476b0dac9799c720354d30b3a85c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c410e346518c8c8ef36811dd5c86707.png)
②设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86235b43e1938a3bd3620e31907947eb.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc72e22c2c9701c1ec79c4a1c10951c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐3】如图,在平面直角坐标系中,直线
与x轴、y轴分别交于A,B两点,抛物线
(a为常数)与y轴交于点C.请完成下列问题;
(1)当抛物线经过点A时如图1,请求出A点坐标及抛物线的解析式;
(2)在(1)的条件下,抛物线
与直线
的另一个交点为E.抛物线的对称轴与直线
交于点D,若F为抛物线对称轴上的一个动点,以D、E、F为顶点的三角形能否与△ABC相似?若能,请求出所有F点的坐标,若不能,请说明理由.
(3)在函数
中若自变量x的取值范为
,请直接写出函数最大值与最小值的差(结果用含a的代数式表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab466aedd6e176088d8dee7bc3e3aaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7a2d1e6b545afd3b56c5fcb37c70213.png)
(1)当抛物线经过点A时如图1,请求出A点坐标及抛物线的解析式;
(2)在(1)的条件下,抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7a2d1e6b545afd3b56c5fcb37c70213.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab466aedd6e176088d8dee7bc3e3aaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab466aedd6e176088d8dee7bc3e3aaa.png)
(3)在函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7a2d1e6b545afd3b56c5fcb37c70213.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/966d9dd819cba29980da3700422c2497.png)
![](https://img.xkw.com/dksih/QBM/2020/10/30/2582176348119040/2582212544192512/STEM/da9ab54cf26549d3a6c3b4f1e2390ce8.png?resizew=392)
您最近一年使用:0次