解题方法
1 . 化简求值:
(1)
;
(2)化简证明:
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9577d3905e42b82e9e04418e498e4c7.png)
(2)化简证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c6690397ca2300febd71dcb5a9a660a.png)
您最近一年使用:0次
2 . 计算和证明:
(I)求
的值;
(Ⅱ)证明,
.
(I)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5152eabaa91725436ae31904fd4544b8.png)
(Ⅱ)证明,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ff2373ae486e5283daa9c7869e06236.png)
您最近一年使用:0次