【题文】若点在函数的图象上,则函数的值域为( ) A.B.C.D.
【题文】若点在函数的图象上,则函数的值域为( ) A.B.C.D.
题型:难度:来源:
答案
【答案】D
解析
【解析】
试题分析:因为点
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331030103-92249.png)
在函数
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331030103-94057.png)
的图象上,所以
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331030105-84902.png)
,解得
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331030105-31308.png)
,所以
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331030105-56976.png)
,故选D.
考点:1、对数函数的图象;2、幂函数.
举一反三
【题文】若
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331025448-35622.png)
,则
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331025448-16503.png)
的表达式为( )
【题文】设
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331025432-27433.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331025432-38438.png)
,其中
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331025432-92760.png)
且
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331025432-44558.png)
.
(I) 若
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331025433-95678.png)
,求
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331025433-57564.png)
的值; (II) 若
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331025434-22007.png)
,求
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331025433-57564.png)
的取值范围.
【题文】设
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331024525-83017.png)
,则
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331024526-97176.png)
的大小关系是( )
【题文】若
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331024230-95038.png)
,则下列不等式成立的是( )
【题文】
![](http://img.shitiku.com.cn/uploads/allimg/20200331/20200331023309-11738.png)
( )
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