设
,
.
(1)令
,求
的单调区间;
(2)若任意
且
,都有
恒成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64263fe2ca48e694c87496d61e63fb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a7c5c3fc5e552e30bc996c38d3bc407.png)
(1)令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6644b717550512954aff0cac31a393c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61c388166862b3ccfcc7ca749ebe5949.png)
(2)若任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85db25f0623bb097e5a57117df267011.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26d8dafc71b106f39f4e15442220897b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d5b2a5c548a8af71bc15608a51dd6ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
更新时间:2018-04-22 17:57:33
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(Ⅰ)当
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【推荐2】设函数
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较难
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