【题文】已知集合,,则下列结论正确的是( )A.B.C.D.
【题文】已知集合,,则下列结论正确的是( )A.B.C.D.
题型:难度:来源:
【题文】已知集合
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322141226-29275.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322141227-29981.png)
,则下列结论正确的是( )
答案
【答案】C.
解析
【解析】
试题分析:由题意知,
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322141229-28278.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322141229-60969.png)
,所以
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322141229-20379.png)
,故选C.
考点:集合间的基本运算.
举一反三
【题文】集合
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322141103-48017.png)
如图所示,则图中阴影部分所表示的集合是( )
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322141103-53495.png)
【题文】已知非空集合
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322141050-36067.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322141051-97332.png)
,
(1)当
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322141051-50303.png)
时,求
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322141051-87634.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322141052-43529.png)
;
(2)求能使
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322141053-77140.png)
成立的
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322141053-99045.png)
的取值范围.(10分)
【题文】已知集合
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322140946-51790.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322140946-66804.png)
,
(Ⅰ)若
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322140946-75063.png)
,求实数
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322140947-98475.png)
的值;
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322140947-82131.png)
,求实数
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322140947-98475.png)
的取值范围(12分)
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