如图,已知
,
.
![](https://img.xkw.com/dksih/QBM/2021/2/2/2649403331297280/2649460510785536/STEM/0fb96640-39a4-4c81-a989-f392f8d253a4.png?resizew=152)
(1)求证:
;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfb27272b4eb9ed057dd3b4d40697e7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bc6cfc2eafb07d6f690da4d5ca5a754.png)
![](https://img.xkw.com/dksih/QBM/2021/2/2/2649403331297280/2649460510785536/STEM/0fb96640-39a4-4c81-a989-f392f8d253a4.png?resizew=152)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b50834e39c4e028e0fc303b94d571923.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
更新时间:2021-02-02 16:44:07
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【推荐1】如图,已知直线
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(1)DE与BC平行吗?为什么?
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【推荐2】如图,直线
相交于点O,过点O作
,射线
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的大小关系:______,判断的依据是______;
(2)若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c28d2790a97390935125aa897417f970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/178e3fa2e4de57a4c067e79be7d798e7.png)
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(2)若
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【推荐1】已知:如图,
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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【推荐2】如图,在△ABC中,AB=AC,D是BC的中点,连接AD.DE⊥AB,DF⊥AC,E,F是垂足.图中共有多少对全等三角形?请直接用“≌”符号把它们分别表示出来.(不要求证明)
![](https://img.xkw.com/dksih/QBM/2016/2/17/1573971035176960/1573971041198080/STEM/10949e7cd560459ebc2ddb5ad134a66a.png)
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