已知函数
(e为自然常数,
),
,若
,总
,使得
成立,则实数a的取值范围为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2bd16b90823d5f56ffd6c7aa8c8e8e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7739fabf233e5b2136faf751a7ebc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa8158add9f7d495e043698520fca9d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8688297990e6616b7e1b8ee2269b37e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d2c4bc899a4fa555ad9f927e73cca21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e63bbadc6250f7139836ede33205550.png)
更新时间:2021-09-15 22:04:05
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