题目
题型:解答题难度:一般来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172902-23689.png)
(1)判断函数
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172902-69383.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172903-83484.png)
(2)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172902-69383.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172903-83484.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172903-63352.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172903-14668.png)
(2)最大值是:
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172903-89037.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172903-57344.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172903-63352.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172903-14668.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172904-64300.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172903-89037.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172904-64300.png)
上的最小值是:
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172903-57344.png)
(1)设
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172904-92304.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172904-72769.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172904-29354.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172904-93754.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172905-19760.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172905-15681.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172905-14589.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172905-67226.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172905-93519.png)
于是,
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172906-74720.png)
即
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172906-88628.png)
所以,函数
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172903-63352.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172903-14668.png)
(2)由(1)得,
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172904-64300.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172903-89037.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172904-64300.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172903-57344.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172859-19121.png)
(1)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172859-49691.png)
(2)判断
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172859-49691.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172856-38791.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172854-17102.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172851-71211.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190817/20190817172850-32284.png)
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