【题文】已知M={x|y=x2-2},N={y|y=x2-2},则M∩N等于( ) A.NB.MC.R D.Φ
题型:难度:来源:
【题文】已知M={x|y=x
2-2},N={y|y=x
2-2},则M∩N等于( )
答案
【答案】A
解析
【解析】
试题分析:先化简两个集合,再由交集的定义根据所得的集合求两个集合的交集.
由题意
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322203318-55347.png)
.
考点:本题考查交集及其运算,求解的关键是正确理解交集的定义以及对两个集合进行化简.
举一反三
【题文】图中阴影部分所表示的集合是( )
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322203312-24482.jpg)
A.B∩[
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322203312-68438.png)
(A∪C)]
B.(A∪B)∪(B∪C)
C.(A∪C)∩(
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322203312-68438.png)
B)
D.[
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322203312-68438.png)
(A∩C)]∪B
【题文】已知集合
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322203235-18133.png)
,集合
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322203235-87707.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322203236-24179.png)
,求集合
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322203236-35865.png)
; (2)若
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322203236-70908.png)
,求实数
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322203236-99767.png)
的取值范围
【题文】设全集U=R,集合A={x|
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322203204-29290.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322203204-56778.png)
},B={x|1<
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322203204-82043.png)
<8},则(C
UA)∩B等于( )
A.[-1,3) B.(0,2] C.(1,2] D.(2,3)
【题文】设全集U=R,集合A={x|
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322203156-13107.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322203157-91095.png)
},B={x|1<
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322203157-57059.png)
<8},则(C
UA)∩B等于( )
A.[-1,3) B.(0,2] C.(1,2] D.(2,3)
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