题目
题型:解答题难度:一般来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154129-26862.png)
(1)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154129-26021.png)
(2)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154129-26021.png)
(3)若函数
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154129-26021.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154129-77491.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154129-26021.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154129-57274.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154129-12777.png)
解析
试题分析:(1)函数的定义域是使函数有意义的
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154130-25450.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154130-87724.png)
(2)函数
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154129-26021.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154130-65547.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154130-31787.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154130-60017.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154131-54084.png)
(3)可利用函数的单调性求最值来解参数
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154131-69436.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154131-61255.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154131-37608.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154131-49641.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154129-77491.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154131-37608.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154129-77491.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154129-26021.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154132-46232.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154132-38835.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154132-57325.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154133-57650.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154133-34924.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154133-19101.png)
试题解析:21.( 普通班)
(1)要使函数有意义,则有
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154130-87724.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154133-76065.png)
所以函数的定义域为
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154129-77491.png)
(2)函数可化为
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154133-66277.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154134-36447.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154134-25330.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154134-15601.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154134-24098.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154135-68291.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154135-55668.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154129-57274.png)
21.(联办班)
(1)要使函数有意义:则有
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154130-87724.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154133-76065.png)
所以函数的定义域为:
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154129-77491.png)
(2)函数可化为
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154133-66277.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154134-36447.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154134-25330.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154134-15601.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154134-24098.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154135-68291.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154135-55668.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154129-57274.png)
(3)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154133-66277.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154135-12884.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154135-94751.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154135-72531.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154136-28905.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154136-72243.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154136-29805.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154136-31682.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154133-34924.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154133-19101.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154124-42712.png)
A.![]() | B.![]() |
C.![]() ![]() | D.![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154122-47968.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154122-93431.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154122-10765.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154120-26098.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154120-26222.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154121-82385.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154117-10053.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154117-88697.png)
(1)求a,b的值;
(2)解不等式
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154118-71153.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154111-13760.png)
(1)当
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154111-60676.png)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20190820/20190820154112-54898.png)
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