题目
题型:不详难度:来源:
设函数
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150147-56461.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150147-91027.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150148-24700.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150148-36164.gif)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150148-49413.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150149-33139.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150149-62931.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150149-98242.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150148-49413.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150150-49541.gif)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150149-33139.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150149-62931.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150150-39995.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150150-49541.gif)
(3)函数
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150150-77216.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150150-49363.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150151-65328.gif)
∵对任意
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150147-91027.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150148-24700.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150151-64290.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150148-49413.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150150-49541.gif)
(2)∴
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150149-33139.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150149-62931.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150150-39995.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150150-49541.gif)
(3)由题知:函数
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150150-77216.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150151-44760.gif)
且
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150152-33490.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150152-75706.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150152-91995.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150152-38555.gif)
∴函数
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150150-77216.gif)
核心考点
举一反三
⑴
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150131-23149.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150132-60624.gif)
⑵
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150132-69154.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150132-21507.gif)
⑶
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150133-36101.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150133-73564.gif)
⑷
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150133-90508.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150133-88730.gif)
⑸
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150134-78608.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150134-52495.gif)
A.⑴、⑵ | B.⑵、⑶ | C.⑷ | D.⑶、⑸ |
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150112-66637.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150112-41259.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150113-62456.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150113-32538.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150112-66637.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150113-80600.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150113-62456.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150113-53576.gif)
(1)把月供电总费用
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150114-44375.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150113-32538.gif)
(2)核电站建在距
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150113-62456.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205150114-44375.gif)
A.y=与y= | B.y=lnex与y=elnx |
C.y=![]() | D.y=x0与y= |
![](http://img.shitiku.com.cn/uploads/allimg/20200205/20200205145938-43532.gif)
A.(-∞,-2) | B.[-5,-2] | C.[-2,1] | D.[1,+∞) |
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