已知函数
.
(1)求
时,
的单调区间;
(2)若存在
,使得对任意的
,都有
,求
的取值范围,并证明
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3952fa5b33a41b6bf0ed2431ad2614ba.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)若存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1aee5df5f1cc83fad73531af71d6eb32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/790daaa89fc9d093f45023becf765697.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7ae2f960bdb87459f369d493fbb2163.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7d11e68607033ce3156d3c317bfdd77.png)
更新时间:2019-12-22 17:00:58
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解题方法
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