已知函数
和函数
.若对任意
,均存在
使得
成立,求实数
的取值范围________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce6dfe2be7df8642c9341a2742957b68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/607897c4640294357d2ae8f2041e2581.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc780b719f18eebc199c70842a1ebba5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e37d2cbb6338a5c7cca4207a5cb3c334.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17d095844022a8ed5fefc23b24878d20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
更新时间:2020-03-20 20:38:32
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