【题文】已知集合,那么子集的个数是:( )A.B.C.D.
【题文】已知集合,那么子集的个数是:( )A.B.C.D.
题型:难度:来源:
【题文】已知集合
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322145214-52005.png)
,那么
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322145214-84455.png)
子集的个数是:( )
答案
【答案】A.
解析
【解析】
试题分析:由题意,得
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322145215-25502.png)
,共2个元素,所以
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322145216-77026.png)
子集的个数为
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322145216-87353.png)
个.
考点:几何的运算、子集的个数.
举一反三
【题文】若集合
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322145158-37346.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322145158-85936.png)
,,则
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322145159-80199.png)
______________.
【题文】(本小题满分10分) 设集合
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322145148-89215.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322145148-23267.png)
.
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322145148-45464.png)
,判断集合
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322145149-52395.png)
与
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322145149-23413.png)
的关系;
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322145149-62420.png)
,求实数
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322145150-22067.png)
组成的集合
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322145150-25103.png)
.
【题文】设集合
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322145139-16304.png)
,则
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322145139-31297.png)
( )
【题文】若全集
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322145133-80756.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322145134-58378.png)
,则集合
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322145134-32167.png)
关于全集
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322145134-33738.png)
的补集是
A.{2} | B.{0,2} | C.{-1,2} | D.{-1,0,2} |
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