【题文】设,,,则m的取值范围是________.
【题文】设,,,则m的取值范围是________.
题型:难度:来源:
【题文】设
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322130352-46047.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322130352-76381.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322130352-36689.png)
,则m的取值范围是________.
答案
【答案】
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322130353-33299.png)
解析
【解析】由题意,得
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322130353-94349.png)
,解得
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322130353-23979.png)
,即
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322130353-75853.png)
的取值范围是
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322130353-33299.png)
.
考点:集合的关系.
举一反三
【题文】已知
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322130328-69909.png)
,集合
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322130329-12126.png)
,集合
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322130329-65022.png)
(
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322130329-97344.png)
可以等于
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322130330-26832.png)
),则集合B的子集个数为__________.
【题文】设
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322130320-87416.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322130320-71068.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322130321-57506.png)
,则m的取值范围是________.
【题文】已知集合
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322130258-79562.png)
,则A
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322130258-53672.png)
( )
【题文】已知
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322130226-26964.png)
;
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322130227-60762.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322130229-54398.png)
,且
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322130229-27127.png)
,使“
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322130229-73599.png)
”的否定为真命题的实数a的取值范围是
【题文】(本题满分7分)已知命题:“
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322130212-24617.png)
,使等式
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322130213-92215.png)
成立”是真命题.
(1)求实数
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322130213-32452.png)
的取值集合
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322130213-32534.png)
; (5分)
(2)设不等式
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322130214-61700.png)
的解集为
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322130214-78406.png)
,若
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322130214-57358.png)
是
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322130214-65572.png)
的必要条件,求
![](http://img.shitiku.com.cn/uploads/allimg/20200322/20200322130215-36722.png)
的取值范围.
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