1 . 已知四边形
是由
与
拼接而成,如图所示,
,
.
(1)求证:
;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f9e37588440c6beb0889962ba936821.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6363d761828ad84619e6dda1c1cf3cf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/21/108a475c-be39-4d44-9a83-f70f460ab28f.png?resizew=153)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56ab48da8fcb9c375d3ff3e216ef7724.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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2023-06-18更新
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