2011·江西吉安·一模
解题方法
1 . 已知函数![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d5b37d4dd0e834611c6551ea13794c6.png)
(1)试确定
的取值范围,使得函数
在
上为单调函数;
(2)当
时,判断
和
的大小,并说明理由;
(3)求证:当
时,关于
的方程
在区间
上,总有两个不同的解.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d5b37d4dd0e834611c6551ea13794c6.png)
(1)试确定
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7077fd2d7d74478891bfc360dc249f9a.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17988cb33273869bda17fa256f968230.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f14be574d4eaf7f7e0d2b28ade7f3ea1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2709ca478fb15ea08e8aa55328eae8e6.png)
(3)求证:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ccc2e60c40781eca527195c5a721169.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b52edba6a1ad0064cf343a5f602567c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7077fd2d7d74478891bfc360dc249f9a.png)
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