题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020171922-56643.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020171922-63325.png)
设
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020171922-48977.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020171922-79799.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020171923-61900.png)
(2)求证:对任意
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020171923-75485.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020171923-96533.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020171923-99495.png)
解析
试题分析:解:(1)依题意
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020171923-97597.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020171924-15514.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020171922-79799.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020171924-17418.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020171924-37805.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020171924-63707.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020171925-94752.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020171923-99495.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020171925-78898.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020171925-88486.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020171925-30788.png)
设
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020171925-66158.png)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020171925-82501.png)
考虑到
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020171926-69255.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020171926-51472.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020171926-40912.png)
又当
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020171926-34631.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020171927-77497.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020171927-93207.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020171927-48767.png)
所以对任意
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020171923-75485.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020171927-51585.png)
点评:解决的关键是利用二项式定理以及导数的思想来证明不等式的成立,属于基础题。
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020171917-41052.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020171917-13015.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020171911-24039.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020171911-71661.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020171900-71967.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020171900-82677.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020171901-87313.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020171857-90230.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020171857-35656.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191020/20191020171843-58127.png)
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