已知函数
.
(1)求不等式
的解集;
(2)若
,
存在正实数
使其成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c4b80c0495ddfd6469c4e9bcc75484a.png)
(1)求不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e6a003922f17f1e7ed37e7013655e73.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5be97cd1c7111b654d87d8fbb63b6a84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5133732ea4a5ae0ac43086a9b16f8d74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
更新时间:2020-02-20 22:13:01
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