【题文】已知函数的定义域为,的定义域为,则A.B.C.D.
【题文】已知函数的定义域为,的定义域为,则A.B.C.D.
题型:难度:来源:
答案
【答案】D
解析
【解析】
试题分析:因为
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322152823-58427.png)
,所以
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322152825-54599.png)
,所以
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322152825-97133.png)
;又因为
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322152823-58923.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322152826-47479.png)
,所以
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322152826-25560.png)
,所以
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322152826-78493.png)
.
考点:函数的定义域及集合间的运算.
举一反三
【题文】已知集合A=
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322152800-57552.png)
-2,3,6
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322152800-96143.png)
-9
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322152800-11421.png)
,集合B=
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322152800-57552.png)
3,
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322152800-79626.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322152800-11421.png)
.若B
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322152800-69552.png)
A,则实数
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322152800-96143.png)
=
【题文】已知全集
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322152741-78458.png)
,集合
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322152741-70557.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322152741-78321.png)
(1)用列举法表示集合A与B;
(2)求
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322152742-98258.png)
及
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322152742-82929.png)
.
【题文】设集合
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322152724-24606.png)
,则
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322152725-22147.png)
=( )
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