解题方法
1 . 设函数
,且
,
.
(1)求
的值,并讨论
的单调性;
(2)若
,使得
成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee41f2b7191b0455e851b6c2138e52dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/104375baf5cef5eb92cfc7cf13b80193.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6855784817151468771f29c0fc38fc9.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0071931196b198f5b32f7bbeaf15923f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3930261eae8ed6176f5ae694bd1da5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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2 . 下列函数中,在区间
上单调递减的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c7bc1ba95ebf28f62bdc976485a36b.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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