名校
解题方法
1 . 已知函数
.
(1)若不等式
的解集为
,求
的取值范围;
(2)解关于
的不等式
;
(3)若不等式
对一切
恒成立,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3376b6620c7739ebcb0bfe0fb38afc0d.png)
(1)若不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b2389b9626902a4421727383d1f8da1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3ed15aa3dcc4211fb520b5b942c989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)解关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a06d442d1936c6b9a1a9a2eb2b56e53a.png)
(3)若不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b55bb7c9255ea0de2a6bb2d77cef503.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/441aa139b86d350c97a7e4e6dc792c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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