题目
题型:不详难度:来源:
已知函数
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223826-31679.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223826-83950.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223827-39550.gif)
在
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223827-54172.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223827-86184.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223827-86184.gif)
(Ⅰ)如果函数
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223827-75277.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223830-21779.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223830-66575.gif)
(Ⅱ)研究函数
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223831-63144.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223826-83950.gif)
(Ⅲ)若把函数
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223831-63144.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223826-83950.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223831-42429.gif)
求
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223831-42429.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223831-47145.jpg)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223831-63956.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223832-10580.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223832-38507.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223832-46312.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223832-21368.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223833-46975.gif)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223833-23373.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223833-65265.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223833-55517.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223832-46312.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223834-87960.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223834-41294.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223834-59252.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223835-81753.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223835-66695.gif)
∴当
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223831-63956.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223832-10580.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223832-38507.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223832-46312.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223832-21368.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223833-46975.gif)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223833-23373.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223833-65265.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223833-55517.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223832-46312.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223834-87960.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223834-41294.gif)
(10分)
(Ⅲ)由(Ⅱ)知,
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223832-46312.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223833-46975.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223834-41294.gif)
∴当
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223835-71834.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223835-94014.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223832-46312.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223836-49232.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223837-78574.gif)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223837-53443.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223838-77741.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223832-46312.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223838-10254.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223838-37393.gif)
得
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223838-17292.gif)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223839-54426.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223839-23577.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223832-46312.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223836-49232.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223839-82570.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223834-59252.gif)
核心考点
试题【(本小题满分14分)已知函数有如下性质:如果常数,那么该函数在上是减函数,在上是增函数,(Ⅰ)如果函数的值域是,求实数的值;(Ⅱ)研究函数(常数)在定义域内的单】;主要考察你对导数的意义等知识点的理解。[详细]
举一反三
曲线f(x)=ln(2x-1)上的点到直线2x-y+3=0的最短距离是 ( )
A.![]() | B.![]() | C.![]() | D.0 |
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223752-46970.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223752-57996.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223753-95459.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223753-11423.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223753-71485.jpg)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223742-75824.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223743-48697.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223743-17229.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223743-51070.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223744-63359.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223744-72658.gif)
A.![]() | B.![]() | C.![]() ![]() | D.![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223730-64915.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223731-61304.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223730-64915.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223730-64915.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223719-23752.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223719-53553.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017223720-66572.gif)
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