名校
解题方法
1 . 设函数
.
(1)是否存在
,使得
对
恒成立?若存在,试给出一个符合题意的实数
并加以证明;若不存在,请说明理由;
(2)若
时,求
的值域.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9f5dc74e0634a2704cf9132ba638eed.png)
(1)是否存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbb16c605d4cbd537fe1dae96707323.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d96b743603ab1c10330622f16db78dbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aee9c7242982ba52348c1f760c7e0f8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
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