解题方法
1 . 在平面四边形
中,已知
,
,
.
(1)若
,
,
,求
的长;
(2)若
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/230f6a04c197e6036b8d3d7680b96ad2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c5d383c419b53ea5159625f306760b9.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27cde33974f1c49a3df4589c00974c99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd244c4ca2ae50d2b87fb221a191fc12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4ee3eb2db791070d3e5269b8f3ba4a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94c905599045694c50d401bfc78c394f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1bdd948550c8b796a4eee38b204f299.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3039c774e00f6520449aa9d4b3c45464.png)
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2020-03-19更新
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4卷引用:2020届天一大联考海南省高三年级第一次模拟考试数学试题
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