已知函数
.
(1)若
,求证:当
时,
;
(2)若存在
,使
,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf1dc5d629aa09850396345b4350cdd0.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2428d03e07fd61dbfc209629ddb33873.png)
(2)若存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8a3b9d341ef12bbbe43a4a63e26ae68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a194e46444e8a00d5f6bd6d06a86e61b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
更新时间:2017-08-15 14:53:41
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