【题文】三个数的大小关系为( )A.B.C.D.
题型:难度:来源:
【题文】三个数
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330094626-34678.png)
的大小关系为( )
答案
【答案】D
解析
【解析】
试题分析:借助指数函数
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330094628-30981.png)
的图象,由于函数
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330094628-30981.png)
在
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330094629-28703.png)
上为减函数,
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330094629-45024.png)
,可知考查
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330094629-17001.png)
,在由对数函数
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330094630-74565.png)
和
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330094630-31636.png)
的图象考查
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330094630-24960.png)
,
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330094631-23117.png)
得
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330094628-22955.png)
;
考点:指数函数图象和性质;2.对数函数图象和性质;
举一反三
【题文】函数
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330094620-28360.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330094621-97181.png)
恒过定点,其坐标为
.
【题文】(本小题满分8分)已知函数
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330094609-50928.png)
是偶函数.
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330094609-36266.png)
的值;
(Ⅱ)设
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330094610-47544.png)
,若函数
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330094610-15872.png)
与
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330094610-10595.png)
的图象有且只有一个公共点,求实数
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330094611-42307.png)
的取值范围.
【题文】设
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330094606-32861.png)
,则
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330094606-76538.png)
的值为
.
【题文】(本小题满分8分)计算:
(Ⅰ)
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330094558-11044.png)
;
(Ⅱ)
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330094559-91173.png)
+
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330094559-68274.png)
.
【题文】(本小题满分8分)已知函数
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330094544-16874.png)
是偶函数.
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330094545-70134.png)
的值;
(Ⅱ)设
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330094546-20143.png)
,若函数
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330094546-73387.png)
与
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330094547-98698.png)
的图象有且只有一个公共点,求实数
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330094547-64948.png)
的取值范围.
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