1 . 下列语句中,说法正确的有
(1)当
是一个大于2的常数时,函数
是指数函数;
(2)当
时,方程
有2个不等实根;
(3)定义
,设函数
,
,则函数
的最小值为
;
(4)存在正实数
使不等式
成立,则实数
的取值范围为
.
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50f9b11bf622ff0a39d7ce85cf2b60d0.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8083af8b668a214bc64ebe2519998d20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31a008c15cf8473d00956205c2624533.png)
(3)定义
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48b20de722937dc89918659abba69926.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d35cbf1ce8034e0b927a22ef64d969b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98272788dd5be4ddb65e03de2086aefb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b6894e8c345a035e89ec672503a01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(4)存在正实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51f0f25fb17f24a0f92e328598a151d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab8aa778be26da37a06328b4383f8793.png)
A.(1)(2) | B.(2)(3) | C.(2)(4) | D.(3)(4) |
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