【题文】已知a=3,b=log,c=log,则()A.a>b>cB.b>c>aC.b>a>cD.c>b>a
【题文】已知a=3,b=log,c=log,则()A.a>b>cB.b>c>aC.b>a>cD.c>b>a
题型:难度:来源:
【题文】已知
a=3
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328034254-42650.png)
,
b=
log
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328034255-23826.png)
,
c=
log
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328034255-92057.png)
,则()
A.a>b>c | B.b>c>a | C.b>a>c | D.c>b>a |
答案
【答案】A
解析
【解析】因为3
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328034254-42650.png)
>1,o<
log
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328034255-23826.png)
<1,
c=
log
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328034255-92057.png)
<0,所以
a>
b>
c,故选A
【考点】指数函数和对数函数的性质.
举一反三
【题文】若
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328034241-33809.png)
,则下列结论正确的是 ( )
【题文】函数
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328034208-97568.png)
的反函数为________.
【题文】已知函数
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328034156-11143.png)
是函数
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328034156-55592.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328034156-59491.png)
且
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328034157-81628.png)
)的反函数,其图像过点
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328034157-43252.png)
,则
.
【题文】若
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328034135-34998.png)
,则( )
【题文】已知
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328034129-99432.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328034130-98386.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328034130-26143.png)
则
A. a>b>c | B.b>a>c | C.a>c>b | D.c>a>b |
最新试题
热门考点