1 . 设集合
,
,则
. ( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65609aeddfedf114cf6889b9c0a36d2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff583135251bcd8f405c6cec198f6243.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25029c10c11e7ef0bc6bea67ba524a13.png)
您最近一年使用:0次
2 . 函数
的定义域为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/446f653af671bafe76711759295bd6e1.png)
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/298ef0c25e99a84f3808ef0431ab4f3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/446f653af671bafe76711759295bd6e1.png)
您最近一年使用:0次
3 . 函数
的定义域为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a43b2faa4f81f32d94612dce724e772b.png)
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca543ad54da566e2befd9f1fc64ed2ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a43b2faa4f81f32d94612dce724e772b.png)
您最近一年使用:0次