已知函数
,若对任意
,存在
,
,则实数
的取值范围为_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37e1ab0941e49f178c2b56456d85d8e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a222e9815af4a9bd139bc582cc771ec6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ae2fe939cb373eecdca55afa79e451a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ea9655f1d25bb28f5433759c1aa2786.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
更新时间:2019-09-12 22:14:27
|
【知识点】 根据二次函数的最值或值域求参数
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