题目
题型:不详难度:来源:
(1)已知
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234150-38270.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234151-24906.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234151-19136.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234151-71679.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234151-65175.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234152-31293.png)
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234152-62598.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234152-59921.png)
因为对一切xÎR,恒有
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234152-28223.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234153-48701.png)
从而得
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234151-19136.png)
(另解:利用重要不等式
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234153-17514.png)
(2)构造函数
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234153-66848.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234153-24675.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234153-29767.png)
因为对一切xÎR,都有
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234152-28223.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234154-62078.png)
从而证得:
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234152-31293.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234141-27906.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234141-61430.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234142-43977.png)
A.3 | B.![]() | C.4 | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234130-84440.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234133-23662.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234133-23402.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234133-42406.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234125-25286.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234125-86149.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234125-13120.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234125-39433.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234126-58558.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234106-64773.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234106-38267.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234106-38495.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234107-55898.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234107-46157.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234107-50908.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234106-38495.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234107-18366.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234106-38267.png)
(2)试问
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234107-50908.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234106-38495.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234107-38273.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234108-50410.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234108-55180.png)
|
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234046-78466.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234046-38234.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234046-15833.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234046-70016.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234047-74795.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234047-80202.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234047-35179.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234047-54777.png)
(1)求椭圆标准方程;
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234048-74844.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234048-13744.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234048-10519.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234048-50257.png)
(3)若
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234049-41323.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234048-13744.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234049-35800.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234047-54777.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234049-20932.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234049-83445.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234047-80202.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234050-87877.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234047-54777.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234049-20932.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234049-83445.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015234050-89553.png)
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