【题文】已知全集,则=( )A.B.C.D.
题型:难度:来源:
【题文】已知全集
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322141811-69430.png)
,则
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322141811-31189.png)
=( )
答案
【答案】C
解析
【解析】
试题分析:根据全集和补集的定义求出
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322141813-97488.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322141813-16613.png)
∵全集U={1,2,3,4,5,6,7},A={2,4,5},则 由集合的补集的定义可得
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322141813-94238.png)
={1,3,6,7}.
考点:补集及其运算.
举一反三
【题文】(本题满分14分)已知全集
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322141758-59865.png)
,集合
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322141758-39695.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322141758-30197.png)
,
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322141758-32456.png)
、
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322141759-94150.png)
;
(2)若集合
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322141759-14467.png)
是集合A的子集,求实数k的取值范围.
【题文】已知集合A={
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322141632-57559.png)
|0<log
3![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322141632-57559.png)
<1},B={
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322141632-57559.png)
|
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322141632-57559.png)
≤2},则A∩B=( )
A.(0,1) | B.(0, 2![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322141632-71409.png) | C.(1,2) | D.(1,2![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322141632-71409.png) |
【题文】设全集为R,集合
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322141601-75292.png)
,则
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322141601-31730.png)
( )
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