如图,在矩形
中,
分别是
上的点,且
,
;
![](https://img.xkw.com/dksih/QBM/2020/2/21/2404002747490304/2404695665614848/STEM/6ac2e6495a534365bb3f57cb3d9fd074.png?resizew=175)
(1)求证:
;
(2)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d70de1ffdd9aa376b09bbcfa12644a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6cb4ffad11153b41f0e030df2b091d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92034dd2bb9480b18709d01153467f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/553a93e0b6156befa00b50bdfaef95d9.png)
![](https://img.xkw.com/dksih/QBM/2020/2/21/2404002747490304/2404695665614848/STEM/6ac2e6495a534365bb3f57cb3d9fd074.png?resizew=175)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8de4a54cc7818be87a239f6de5f5d05b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ddb7b44586e90485ebbbf20a574e170.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
更新时间:2020-02-22 21:08:46
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逨运动,速度为1cm/s,过点P作PM⊥AD于点M,连接PQ,设运动时间为t(s)
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