名校
解题方法
1 . 已知定义在
上的函数
下列命题正确的个数为( )
①函数
的值域是
;
②当
时,函数
有9个零点;
③关于
的方程
有
个根;
④存在
,使得不等式
成立.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7dcdd87d593df4a5c5e98d47fe1cfa6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/698a81303528a1f937c0dae37f67b897.png)
①函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb87c830a03204a5b783ad4c2ba49c4e.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7bac79b875c35e01d9b90fc1659b0af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
③关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f447201e381e683bdf9714b68e17c4b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2553179e2ab7a7252b0abdfa11139343.png)
④存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32d6182d432defab6dbbecff5bcd846f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3f732e24fa3d5a6a83f475f6aac7b7a.png)
A.1 | B.2 | C.3 | D.4 |
您最近一年使用:0次