已知函数
,
.
(Ⅰ)求
的导数
;
(Ⅱ)当
时,求证:
在
上恒成立;
(Ⅲ)若
在
上恒成立,求
的最大值.
注:以下不等式可参考使用:对任意
,
,
,恒有
,当且仅当
时“=”成立.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9a966be67132ca625f3c76a120e304c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e97769855336d73371930df1f187875e.png)
(Ⅰ)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b6894e8c345a035e89ec672503a01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a15bccf9756ec716bd5c04e2641b6441.png)
(Ⅱ)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c87b351f16728b0023fd63678f8103c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6478b72a0a9b73b40d3c6dac11aa4dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f38ab1d9d49cc85d21551b7bcd6daf5.png)
(Ⅲ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f98a9e4d0bfac5d6c2c2d99f51c01e2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f38ab1d9d49cc85d21551b7bcd6daf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
注:以下不等式可参考使用:对任意
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ab89497e6e93894e0bb8e2db14ee02b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a170144251b3a0510b6a29bd5b77c596.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db3628a3eef8edc8dafbb942c00bb003.png)
更新时间:2021-08-24 15:51:53
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