【题文】若集合,,则为
【题文】若集合,,则为
题型:难度:来源:
答案
【答案】A
解析
【解析】
本题考查集合与不等式的性质。
![](http://img.shitiku.com.cn/uploads/allimg/20200323/20200323133459-95352.png)
,所以
![](http://img.shitiku.com.cn/uploads/allimg/20200323/20200323133459-86285.png)
有两个根
![](http://img.shitiku.com.cn/uploads/allimg/20200323/20200323133459-89524.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200323/20200323133459-52380.png)
的解集为
![](http://img.shitiku.com.cn/uploads/allimg/20200323/20200323133459-81407.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200323/20200323133500-85818.png)
,故选择A
举一反三
【题文】已知集合
![](http://img.shitiku.com.cn/uploads/allimg/20200323/20200323133436-95518.png)
=
![](http://img.shitiku.com.cn/uploads/allimg/20200323/20200323133436-74635.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200323/20200323133436-87586.png)
={x|
![](http://img.shitiku.com.cn/uploads/allimg/20200323/20200323133436-53105.png)
},且A
![](http://img.shitiku.com.cn/uploads/allimg/20200323/20200323133437-57708.png)
(?RB),则实数a的取值范围是
A.a≤1 B.a<1 C.
![](http://img.shitiku.com.cn/uploads/allimg/20200323/20200323133437-40476.png)
<2 D.
![](http://img.shitiku.com.cn/uploads/allimg/20200323/20200323133437-12146.png)
【题文】已知集合
![](http://img.shitiku.com.cn/uploads/allimg/20200323/20200323133427-84052.png)
=
![](http://img.shitiku.com.cn/uploads/allimg/20200323/20200323133428-48860.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200323/20200323133428-93804.png)
={x|
![](http://img.shitiku.com.cn/uploads/allimg/20200323/20200323133429-58897.png)
},且A
![](http://img.shitiku.com.cn/uploads/allimg/20200323/20200323133429-87700.png)
(?RB),则实数a的取值范围是
A.a≤1 B.a<1 C.
![](http://img.shitiku.com.cn/uploads/allimg/20200323/20200323133429-55983.png)
<2 D.
![](http://img.shitiku.com.cn/uploads/allimg/20200323/20200323133429-49017.png)
【题文】设集合
![](http://img.shitiku.com.cn/uploads/allimg/20200323/20200323133415-15442.png)
,则
![](http://img.shitiku.com.cn/uploads/allimg/20200323/20200323133415-68815.png)
等于 ( )
【题文】设集合
![](http://img.shitiku.com.cn/uploads/allimg/20200323/20200323133356-46394.png)
,则
![](http://img.shitiku.com.cn/uploads/allimg/20200323/20200323133356-76673.png)
等于 ( )
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