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解题方法
1 . 设函数
.
(1)求关于x的不等式
的解集;
(2)若对任意的
,
恒成立,求实数a的取值范围;
(3)若
,且
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e082e154a42465c8810ae25f6b3fdff1.png)
(1)求关于x的不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac4d9f036ff9696aa178435630f1badb.png)
(2)若对任意的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb63478132d4c1fef3c17e591919da83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833bd7d3b6627d362f4df8c3d3e62254.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/859458471c86ae39e0cc42d2d960d03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26d8dafc71b106f39f4e15442220897b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56c1955d880af7a2d046da8627a6f527.png)
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