(1)若不等式
对一切
恒成立,求实数a的取值范围;
(2)若不等式
对一切
恒成立,求实数a的取值范围;
(3)设集合
,求实数a的取值范围;
(4)若存在实数x使
成立,求实数a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46e8dd97157eedc6ff3474c8fc232e21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a57996290794e082b21d8f1dfc322a.png)
(2)若不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3aa3b9e7dcd741d3c0d78badcdbf9df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a57996290794e082b21d8f1dfc322a.png)
(3)设集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e2f237b053f81b795b6027d32229d78.png)
(4)若存在实数x使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a9cce9d50f34ac8fcd8e774c515543c.png)
更新时间:2021-12-25 22:55:40
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