题目
题型:解答题难度:简单来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181117-89573.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181117-83110.png)
(2)要使函数
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181117-10604.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181118-26073.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181118-29933.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181118-32968.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181118-12884.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181118-49237.png)
解析
试题分析:(1)由
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181119-60925.png)
令
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181119-15563.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181118-32968.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181118-12884.png)
(2)分离参数得
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181119-24143.png)
换元得:
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181119-64513.png)
得:
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181118-49237.png)
点评:利用函数的单调性确定其值域是高考热点,关键在于发现函数的单调性
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181116-50281.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181116-22425.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181116-89259.png)
值为 ______________ .
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181114-38872.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181107-81785.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181107-69720.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181107-27074.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181108-87410.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181108-75586.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181108-55665.png)
(1)设
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181108-98037.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181109-91866.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181109-58604.png)
(2)如果
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181107-81785.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181107-81785.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181107-81785.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181107-81785.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181101-32565.png)
(Ⅰ)解不等式:
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181102-59276.png)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181102-38141.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181102-64464.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181102-56774.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181057-60309.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181058-80792.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181058-44722.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181058-86603.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819181058-54456.png)
A.a>b>c | B.c>b>a | C.b>a>c | D.c>a>b |
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