已知
,
.
(1)求
的值;
(2)若
,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c38a64fcea4757ca6f4f91d54e54e9a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25f63dc02238b087ff47e9aa5bf6759d.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/469369de31e971960a8228d2dcc4941f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48ad2054cf6dad446a8c0a371adda66f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14f65044c12d07e5f37b5e0e68d9f5af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eacde1c42151734fdc60f3001b590de.png)
更新时间:2020-02-19 22:36:05
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解题方法
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【推荐2】在
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