【题文】已知集合若,则实数的取值范围是,其中 .
【题文】已知集合若,则实数的取值范围是,其中 .
题型:难度:来源:
答案
【答案】4
解析
【解析】
试题分析:因
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322133828-58125.png)
,要使
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322133827-72182.png)
,只需
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322133829-24665.png)
,故
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322133829-46373.png)
考点:集合运算
举一反三
【题文】已知集合
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322133807-82687.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322133808-63944.png)
,
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322133808-53413.png)
,求
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322133808-44729.png)
;
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322133808-89117.png)
,求实数a的取值范围.
【题文】已知集合
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322133754-67931.png)
,求
(1)当
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322133754-88352.png)
时,
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322133755-26092.png)
中至多只有一个元素,求
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322133755-78678.png)
的取值范围;
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322133755-26515.png)
时,
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322133755-26092.png)
中至少有一个元素,求
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322133755-78678.png)
的取值范围;
(3)当
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322133755-78678.png)
、
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322133755-10353.png)
满足什么条件时,集合
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322133755-26092.png)
为非空集合。
【题文】集合A={x|x
2-ax+a
2-19=0},B={x|x
2-5x+6=0},
C={x|x
2+2x-8=0}.
(Ⅰ)若A=
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322133734-15815.png)
,求a的值;
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322133734-87189.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322133734-66227.png)
A∩B,A∩C=
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322133734-87189.png)
,求a的值.
【题文】设全集U是实数集
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322133727-83195.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322133727-87447.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322133727-72922.png)
都是U的子集,则图中阴影部分所表示的集合是( )
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322133728-64727.jpg)
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