题目
题型:解答题难度:一般来源:不详
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053744-16948.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053744-88199.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053744-88199.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053745-35986.png)
=
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053745-66996.png)
=
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053745-51720.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053745-79900.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053745-63929.png)
于是
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053746-51947.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053746-89854.png)
所以函数y=
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053746-64468.png)
因此,函数y=
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053746-64468.png)
即当x=2时,ymax=3;当x=6时,ymin=
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053746-89852.png)
解析
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053736-36326.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053736-21156.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053736-56855.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053737-30778.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053737-67584.png)
(1)试证明:函数
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053736-36326.png)
(2)判断
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053736-36326.png)
(3)解不等式
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053737-42958.png)
(4)试求函数
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053736-36326.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053737-94236.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053733-18628.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053733-74420.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053733-63335.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053733-18628.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053733-26571.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053734-89886.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053730-43299.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053730-52133.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053730-14218.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053730-36883.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053730-75193.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053731-96430.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053731-11390.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053731-65513.png)
A.最小值-5 | B.最大值-5 | C.最小值-1 | D.最大值-3 |
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053727-42320.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053727-19754.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053727-51796.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053727-28676.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053728-43919.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053728-75044.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053721-70471.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053721-76661.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053721-98700.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053721-98700.png)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053721-98700.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053721-57799.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053721-86046.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053721-44634.png)
![](http://img.shitiku.com.cn/uploads/allimg/20190818/20190818053722-15111.png)
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