【题文】如果,那么A.B.C.D.
【题文】如果,那么A.B.C.D.
题型:难度:来源:
【题文】如果
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330091758-34132.png)
,那么
答案
【答案】 C
解析
【解析】
试题分析不等式
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330091800-36340.png)
可化为:
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330091800-47690.png)
又∵函数
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330091800-20480.png)
的底数0<
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330091801-68972.png)
<1故函数
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330091801-39401.png)
为减函数∴x>y>1.
考点:对数函数的单调性.
点评:本题考查了对数函数的单调性及运算.
举一反三
【题文】若
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330091749-46806.png)
的最小值是_____________
【题文】若
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330091744-96040.png)
的最小值是_____________
【题文】已知
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330091739-25022.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330091739-24756.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330091739-47379.png)
,则a,b,c的大小关系是
A.a > b > c | B.c > b > a | C.c > a >b | D.a>c>b |
【题文】已知函数
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330091734-39559.png)
(b>0且b≠1)的图象如图所示,那么函数
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330091734-11095.png)
的图象可能是
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330091735-65061.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330091735-46164.png)
【题文】已知
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330091726-81197.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330091727-44916.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330091727-61996.png)
,则a,b,c的大小关系是
A.a > b > c | B.c > b > a | C.c > a >b | D.a>c>b |
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