【题文】已知,,则 .
【题文】已知,,则 .
题型:难度:来源:
答案
【答案】12
解析
【解析】
试题分析:首先求
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330095917-78532.png)
,再求
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330095917-23518.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330095917-10482.png)
考点:1.对数运算法则;2.对数恒等式
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330095918-66311.png)
举一反三
【题文】若
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330095903-75701.png)
,用“<”将
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330095903-12642.png)
连结起来
.
【题文】若函数
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330095854-54614.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330095854-32997.png)
在区间
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330095854-75582.png)
上是单调增函数,则常数
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330095854-45702.png)
的取值范围是
.
【题文】若函数
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330095848-23280.png)
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330095848-64736.png)
在区间
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330095849-10238.png)
上是单调增函数,则常数
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330095849-24300.png)
的取值范围是
.
【题文】(本小题满分12分)
(1)化简
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330095838-19876.png)
log
85
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330095839-51483.png)
log
2516 + log
324 .
(2)若log
2(3x-2)<2,试求x的取值范围.
【题文】(本小题满分12分)
(1)化简
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330095831-59685.png)
log
85
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330095831-53159.png)
log
2516 + log
324 .
(2)若log
2(3x-2)<2,试求x的取值范围.
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