【题文】已知集合,,则( )A.B.C.D.
【题文】已知集合,,则( )A.B.C.D.
题型:难度:来源:
答案
【答案】B
解析
【解析】
试题分析:由
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322183455-64240.png)
,可得
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322183456-61712.png)
.又因为
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322183455-98634.png)
.所以
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322183455-59617.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322183457-71127.png)
.
考点:1.二次不等式的解法.2.集合的运算.
举一反三
【题文】已知集合
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322183447-30202.png)
,集合N="{" x|lg(3-x)>0},则
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322183447-17895.png)
( )
A.{x|2<x<3} | B.{x|1<x<3} | C.{x|1<x<2} | D.![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322183448-99845.png) |
【题文】已知全集
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322183420-42870.png)
,集合
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322183420-92461.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322183420-13654.png)
.若
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322183420-68396.png)
,则实数
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322183420-80079.png)
的取值范围是
.
【题文】已知全集
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322183409-92660.png)
,集合
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322183410-23411.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322183410-24851.png)
.若
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322183410-58204.png)
,则实数
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322183411-12102.png)
的取值范围是.
【题文】集合
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322183400-16566.png)
,则
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322183400-94430.png)
( )
【题文】集合
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322183347-19834.png)
,则
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322183347-50722.png)
( )
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