【题文】已知,,则( )A.B.C.D.
【题文】已知,,则( )A.B.C.D.
题型:难度:来源:
【题文】已知
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328023250-46685.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328023250-75567.png)
,则( )
答案
【答案】C
解析
【解析】
试题分析:由于
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328023253-77242.png)
,所以
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328023253-67406.png)
;
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328023254-67413.png)
,因此
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328023254-89406.png)
;
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328023254-24249.png)
,因此
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328023254-41536.png)
.
考点:指数函数和对数函数性质.
举一反三
【题文】若
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328023244-45553.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328023245-22985.png)
,则“
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328023245-80087.png)
”是“
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328023245-83846.png)
”的( )
A.充分不必要条件 | B.必要不充分条件 |
C.充要条件 | D.既不充分又不必要条件 |
【题文】在下列图象中,二次函数
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328023219-88066.png)
与指数函数
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328023219-60470.png)
的图象只可能是( )
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328023219-24283.jpg)
【题文】已知函数
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328023152-98386.png)
,对于任意的
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328023152-34085.png)
,有如下条件:
①
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328023152-10103.png)
; ②
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328023153-25877.png)
; ③
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328023153-69585.png)
; ④
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328023153-71995.png)
.
其中能使
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328023154-51928.png)
恒成立的条件序号是
.
【题文】已知
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328023126-84203.png)
是定义在
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328023127-77045.png)
上的偶函数,且在
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328023127-28748.png)
上是增函数,设
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328023127-25784.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328023127-15071.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328023128-13089.png)
,则
![](http://img.shitiku.com.cn/uploads/allimg/20200328/20200328023128-59182.png)
的大小关系是( )
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