已知函数
.
(1)若
在
上恒成立,求实数
的取值范围;
(2)证明:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bf07dcef142d28e166e8cf6b18f28b6.png)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc26459969787b038c8eaa33f0236c2.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e38c541dec8fce1d26886e5ef7d21f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeb49dbba01c4ff5f686ffc8828351b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bf07dcef142d28e166e8cf6b18f28b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/947a66bfe244036da12f87567097092d.png)
更新时间:2019-04-13 10:53:32
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