题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071108-28925.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071108-13369.gif)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071108-81285.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071109-26790.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071109-70240.gif)
(Ⅱ)若对
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071109-14435.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071109-24935.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071110-61234.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071110-57599.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071110-27170.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071110-91891.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071111-88757.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071111-91209.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071108-13369.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071111-31020.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071111-21712.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071111-13613.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071112-59346.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071112-70173.gif)
故
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071109-70240.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071110-27170.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071110-91891.gif)
(Ⅱ)法1:当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071112-48722.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071112-34483.gif)
![]() | ![]() | ![]() | ![]() | 1 | ![]() |
![]() | + | 0 | - | 0 | + |
![]() | ↗ | 极大值 | ↘ | 极小值 | ↗ |
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071114-39360.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071109-14435.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071114-96360.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071114-21965.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071115-60649.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071115-55097.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071109-24935.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071109-14435.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071115-14380.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071115-79574.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071109-24935.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071115-58467.gif)
解得
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071116-85666.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071116-96364.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071110-61234.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071111-88757.gif)
法2:由(Ⅰ)得
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071114-39360.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071109-24935.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071115-58467.gif)
对
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071109-14435.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071109-24935.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071109-14435.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071115-58467.gif)
构造函数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071116-28707.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071116-90102.gif)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071117-21300.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071117-79942.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071114-96360.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071117-47701.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071117-38471.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071117-71833.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071118-36458.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071118-29680.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071116-85666.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071116-96364.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071110-61234.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071111-88757.gif)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071103-26165.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071103-13412.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071103-62766.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071103-78327.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071053-34010.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071054-90049.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071054-88708.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071054-20640.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071054-50808.gif)
A.![]() | B.![]() | C.![]() | D.![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071045-22252.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071046-80116.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071046-90477.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071046-80116.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071035-15157.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071035-22796.gif)
(Ⅰ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071035-20424.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071036-85893.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071036-61150.jpg)
( i )求
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071036-87813.gif)
( ii)在
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071036-55466.gif)
(Ⅱ)当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071036-36120.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071036-90509.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071036-85523.gif)
(参考数据
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071036-20471.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071023-28876.gif)
(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071023-39821.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071024-67897.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071024-14926.gif)
(2)若当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071024-39498.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071024-83540.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018071025-25514.gif)
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