如图,在
中,
于点
是
上任意一点,于
点
且
.
![](https://img.xkw.com/dksih/QBM/2020/5/4/2455666952527872/2456232883642369/STEM/a845b2ad-02bb-43b2-9f6d-a5c889a94e26.png?resizew=225)
证明:
.
证明:
(已知)
( )
( )
(已知)
( )
( )( )
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec38bedb55b02c42c1fb552e6cbf7a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb49557be665e7dde8543fa2868ec7f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3e4ca8b58be33aa0b01f29308367f84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://img.xkw.com/dksih/QBM/2020/5/4/2455666952527872/2456232883642369/STEM/a845b2ad-02bb-43b2-9f6d-a5c889a94e26.png?resizew=225)
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a16cf207315e47fa46ce784165f3188d.png)
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e1413bcd4a938ec4c8ecdac7101831.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e880f002c69e22e58364c4d9e89002e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79e6dacd53e10036a6543c481eea3416.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c08980b6afedc04aa04f385791f0163.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66cfa4104c2d85a55e12776d5030d90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0008baabc18430dd757fe78aa8b36a7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3e20ecb4f97971a95d7c7dd0817a0ff.png)
更新时间:2020-05-05 16:41:30
|
【知识点】 根据平行线判定与性质证明
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较易
(0.85)
【推荐2】如图:已知在
中,
,
为
上任意一点,
交
于
,
交
于
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca14fa885a9d04f04e0418b49b118241.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/100b3e7dcd5f34c5234971cd75bff138.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f24943cc5c9db4416beeaa20023a4261.png)
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