如图,在△ABC中,AB=AC,D是BC的中点,AC的垂直平分线分别交AC,AD,AB于点E,O,F,连接CO,BO.求证:点O在AB的垂直平分线上.
22-23八年级下·全国·假期作业 查看更多[2]
更新时间:2024-01-25 16:15:08
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【推荐1】如图,在
中,
、
的垂直平分线分别交
于点
、
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(1)若
的周长为a,求
的长(用含有a的代数式表示);
(2)若
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/21/64a157bc-47af-497b-a44c-46686e1cb01c.png?resizew=225)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/645ab05a4b057c24955fea5caabce043.png)
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【推荐2】如图,△ABC中,AB=AC,∠A=36°,AC的垂直平分线交AB于E,D为垂足,连接CE.
(1)求∠BEC的度数;
(2)求证:AE=BC.
(1)求∠BEC的度数;
(2)求证:AE=BC.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/8/f114824f-ca18-4288-bbba-f64de74732a2.png?resizew=86)
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【推荐1】如图,四边形
的对角线
交于点O,且
,E是
上一点,连接
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.
(2)若
,试判断四边形
的形状,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e5c0dd1fab3ddac335bddbe89f0d6e2.png)
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(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b0ebf6f2105d94d00335a35410a5cfb.png)
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【推荐2】已知
是
的角平分线,
,垂足分别是E,F.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/17/84ca54e7-c782-4a90-bb4b-6ecdd6161290.png?resizew=266)
(1)如图①,若
,求证:
;
(2)如图②,连接
,求证:
垂直平分
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/17/84ca54e7-c782-4a90-bb4b-6ecdd6161290.png?resizew=266)
(1)如图①,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/532aece6cfd67e2a97977eed978dbf2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
(2)如图②,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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