题目
题型:解答题难度:简单来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193246-34745.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193246-53794.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193246-45514.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193246-34745.png)
(Ⅱ)设函数
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193247-97713.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193247-23719.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193246-34745.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193247-25611.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193248-48716.png)
解析
试题分析:(1)解:令a=x,b=x
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193248-19558.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193248-54328.png)
(2)解:
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193248-27730.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193248-33343.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193249-64339.png)
点评:中档题,求函数的解析式往往有“待定系数法”,换元法,定义法,“消去法”等。(2)采用的是“消去法”。
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193243-17950.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193243-51020.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193243-65345.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193244-28875.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193244-40278.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193243-17950.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193244-73529.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193229-73506.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193229-63724.png)
(1)试确定
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193229-81433.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193229-39158.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193230-33347.png)
(2)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193229-39158.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193230-33347.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193219-23157.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193219-14764.png)
(Ⅰ)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193219-75857.png)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193220-87261.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193220-96451.png)
(Ⅲ)若
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193220-47831.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193220-75863.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193220-44485.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193211-51781.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193211-20471.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193211-97978.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193211-72204.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193211-54965.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193211-85681.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193209-86692.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193209-48844.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193209-87366.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193210-42111.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190819/20190819193210-99603.png)
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