求解下列问题.
(1)化简
.
(2)已知
,求
的值
(1)化简
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bee013e3a9301e97131730e2cda2a26b.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f7fdccadfa7469825f8a5ccbf495c24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ccc25278a3b54696a581c3fecd79e2f.png)
更新时间:2017-05-03 20:29:42
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(2)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/969b106918cf44777d177a0538da8cb3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04e0e76efd3067a808e75450b305a714.png)
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