【题文】已知集合={0,1,2},则集合中元素的个数是( )A.1B.3C.5D.9
【题文】已知集合={0,1,2},则集合中元素的个数是( )A.1B.3C.5D.9
题型:难度:来源:
【题文】已知集合
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322144132-40907.png)
={0,1,2},则集合
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322144132-54738.png)
中元素的个数是( )
答案
【答案】C
解析
【解析】
试题分析:依题意,可求得集合B={
举一反三
【题文】已知集合
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322144111-99941.png)
,则
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322144111-92005.png)
=( )
【题文】已知集合A={x|x<
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322144054-30463.png)
},B={x|1<x<2},且
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322144054-78123.png)
,则实数
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322144054-30463.png)
的取值范围 ( )
【题文】已知集合
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322144013-84894.png)
,集合
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322144013-44903.png)
,若
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322144015-89991.png)
,那么a取值的集合为_________.
【题文】(12分)设集合
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322143941-53528.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322143941-71918.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322143942-68104.png)
.
(Ⅰ)若
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322143942-47797.png)
,求实数
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322143942-66902.png)
的取值范围; (Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322143942-41182.png)
,求实数
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322143942-66902.png)
的取值范围.
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