1 . 已知函数
(
)是偶函数,若
对一切实数
都成立,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d063e7ff541b1cb60c1827896429c83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e69392d21261afd8e5e5f096634669.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7f2e9cb453511dba45af37cd251b306.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/998a9c302af143f34abaa2cd0273fc00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
您最近一年使用:0次
2 . 4个函数
,
,
,
图象的交点数共有__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2702a5539ca829b8b7a08407f0996e8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acf605ad3d204601efb0421d693d3708.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8129050cdbac05687f29f36eb9fb406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2570287d2e56cc6c976e3be3c2d02ae.png)
您最近一年使用:0次
3 . 函数
的值域为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ad24d2d824085b6c39c745f3d65b59b.png)
您最近一年使用:0次