题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092543-45353.png)
(1)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092544-99201.png)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092544-10618.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092544-57969.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092544-93280.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092544-99201.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092544-25920.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092545-60302.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092545-62208.png)
解析
试题分析:(1)先求出
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092545-92683.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092545-33450.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092546-50973.png)
试题解析:(1)函数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092544-99201.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092546-75250.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092546-27526.png)
令
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092546-27952.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092547-52019.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092547-95059.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092547-37949.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092544-99201.png)
![]() | ![]() | ![]() | ![]() |
![]() | ![]() | ![]() | ![]() |
![]() | ![]() | 极大值 | ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092544-99201.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092544-25920.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092545-60302.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092549-93013.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092549-94078.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092549-37961.png)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092544-10618.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092549-94896.png)
令
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092550-85445.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092550-21369.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092550-78244.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092550-28061.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092551-56723.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092544-93280.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092531-71314.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092532-92178.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092532-86060.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092532-49655.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092533-52842.png)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092533-25810.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092533-52842.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092533-60350.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092520-26967.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092520-67743.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092520-34942.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092520-12565.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092521-52923.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092512-72036.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092512-26160.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092512-31628.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092513-31703.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092455-21023.png)
(1)当b>
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092456-88300.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092456-80056.png)
(2)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092456-80056.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018092442-71870.png)
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