1 . 如图,在△ABC中,
,
,
,点D在线段AB上.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/20/8bfc9cd1-121d-472c-ab41-9909d30989c5.png?resizew=203)
(1)若
,求
的值;
(2)若
,求CD的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11aba28f503a684a232490d37bcd3fd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/20/8bfc9cd1-121d-472c-ab41-9909d30989c5.png?resizew=203)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/395c8d0c2d490ffd4d6aadfb3517f9ec.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11afcbaf1feac7f8c2970db80d856989.png)
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2022-06-20更新
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2卷引用:贵州省遵义市余庆县他山中学2021-2022学年高一下学期第三次联考数学试题