【题文】设,,,则( )A.B.C.D.
【题文】设,,,则( )A.B.C.D.
题型:难度:来源:
答案
【答案】A
解析
【解析】函数
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328203941-89901.png)
是减函数,所以
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328203942-21264.png)
函数
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328203942-17479.png)
是减函数,所以
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328203943-14276.png)
函数
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328203943-65748.png)
是增函数,所以
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328203943-90424.png)
故选A
举一反三
【题文】若
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328203811-60026.png)
,则
【题文】
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328203711-25639.png)
的图象大致是 ( )
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328203711-64647.png)
A. B. C. D.
【题文】若
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328203654-18209.png)
,则( )
A.0<a<b<1 | B.0<b<a<1 | C.a>b>1 | D.b>a>1 |
【题文】在同一坐标系中,函数y=
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328203551-27166.png)
与y=
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328203551-60458.png)
的图象是( )
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328203552-57589.jpg)
【题文】已知2
x+2
-x=5,则4
x+4
-x的值是
.
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