设函数
.
(1)求函数
的单调区间;
(2)设![](https://img.xkw.com/dksih/QBM/2016/10/19/1573078968410112/1573078974939136/STEM/37e12aafed9c41af9e8c51b9d7fc9862.png)
是否存在极值,若存在,请求出极值;若不存在,请说明理由;
(3)当
时.证明:
.
![](https://img.xkw.com/dksih/QBM/2016/10/19/1573078968410112/1573078974939136/STEM/12876bf7f7c54de49c596065dc9d49c2.png)
(1)求函数
![](https://img.xkw.com/dksih/QBM/2016/10/19/1573078968410112/1573078974939136/STEM/874159c40db444368a2d774316a27fa9.png)
(2)设
![](https://img.xkw.com/dksih/QBM/2016/10/19/1573078968410112/1573078974939136/STEM/37e12aafed9c41af9e8c51b9d7fc9862.png)
![](https://img.xkw.com/dksih/QBM/2016/10/19/1573078968410112/1573078974939136/STEM/1f8fba8ea7ca419283bba12ae85e0f3a.png)
(3)当
![](https://img.xkw.com/dksih/QBM/2016/10/19/1573078968410112/1573078974939136/STEM/9c23331eb0c44142a2becd3f016854fd.png)
![](https://img.xkw.com/dksih/QBM/2016/10/19/1573078968410112/1573078974939136/STEM/6cbdc6bbf8e34f5b878adfd4b2199212.png)
更新时间:2016-12-04 22:20:16
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