【问题探究】
(1)如图①,在正方形
中,
为对角线,点E、F分别为边
、
上的动点(不与端点重合),且
,
的延长线交
的延长线于点M,
的延长线交
的延长线于点N,求证:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/13/3d092956-ca6a-4f6d-9d1a-8cfdfcbfd688.png?resizew=225)
【拓展延伸】
(2)如图②,在菱形
中,AC为对角线,点E、F分别为边
、
上的动点(不与端点重合),且
,AF的延长线交
的延长线于点M,
的延长线交
的延长线于点N.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/13/409279ac-875d-48d4-a9d4-ea82a4d7cb28.png?resizew=406)
①求证:
;
②若
,
,连接MN,当
时,求
的长.
(1)如图①,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192155e6a3aade305b76b1eb7c75e30c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ff575e55857af133edb24c8e61504f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cdd9f345915ae742ed3dcd3f9678264.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de9b0dde992c62528f1b5842ae50d7f3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/13/3d092956-ca6a-4f6d-9d1a-8cfdfcbfd688.png?resizew=225)
【拓展延伸】
(2)如图②,在菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a6aef04eceb608a7a2cfc3e566f9e8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cdd9f345915ae742ed3dcd3f9678264.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/13/409279ac-875d-48d4-a9d4-ea82a4d7cb28.png?resizew=406)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de9b0dde992c62528f1b5842ae50d7f3.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c9204f2f7621cf1a937e6f4b8c0d583.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e883f81c66ceef54d2d0556a68ed585.png)
更新时间:2023-04-13 09:47:25
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