已知函数
.
(1)当
时,判断
在定义域上的单调性;
(2)若对定义域上的任意的
,有
恒成立,求实数a的取值范围;
(3)证明:
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48c78c43ab64bd8a3ac3b18c6ac0648a.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/200f24e682c93e02a87f3f9d57dc5d40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若对定义域上的任意的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97148e04ca6a9f9dca0aba91ce4e1d84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66d61d5f66d68b4c4a2a25fd7103621.png)
(3)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0b3fd25a2339eb6d8901d3d921779ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9fc82353331abee0828dee9b38c08f2.png)
更新时间:2020-02-22 19:55:43
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