名校
解题方法
1 . 已知函数
,下列关于函数
的判断:①
的值域为
;②
在
上单调递减;③
的图象关于
轴对称;④方程
至少有一个实根.其中判断正确的序号为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97ee4fe374a1ffecc2bebd7a2e4a46a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eb0ecc38575f1b6fe525bffe9dc39c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/870ebc2f7aabb028024894568d749934.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37506e6bb06c6d08c03064af9d60ed85.png)
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