【题文】若,则的取值范围是 _____ (用区间表示)
【题文】若,则的取值范围是 _____ (用区间表示)
题型:难度:来源:
【题文】若
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330093608-80143.png)
,则
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330093608-75742.png)
的取值范围是
_____ (用区间表示)
答案
【答案】
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330093609-50573.png)
解析
【解析】
试题分析:
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330093609-70078.png)
,当
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330093610-52861.png)
时 ,解得
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330093610-83005.png)
; 当
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330093610-22992.png)
,解得
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330093610-61962.png)
所以a的取值范围是
考点:对数不等式的解法
举一反三
【题文】(本小题满分12分)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330093432-25612.png)
,化简:
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330093432-85726.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330093432-79353.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330093433-94385.png)
,试用
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330093434-99938.png)
表示
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330093434-90170.png)
【题文】若
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330093426-56403.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330093426-35172.png)
__________。
【题文】(本小题满分12分)设函数
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330093412-24608.png)
。
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330093413-68091.png)
,求
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330093413-84798.png)
的取值范围。
(2)求
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330093413-71632.png)
的最值,并给出最值时对应的
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330093414-32907.png)
的值。
【题文】函数
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330093231-43278.png)
的定义域是 ( )
【题文】已知
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330093224-54387.png)
且
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330093224-37379.png)
,则下列不等式中成立的是 ( )
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