题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173312-81971.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173313-27590.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173313-49527.png)
(Ⅰ)当
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173313-98642.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173313-35724.png)
(Ⅱ)若函数
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173314-74379.png)
(Ⅲ)函数
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173313-35724.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173314-83871.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173314-93911.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173314-29052.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173315-39753.png)
令
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173315-46534.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173315-82710.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173315-98199.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173315-11109.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173316-96470.png)
(注:写成
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173316-31040.png)
(Ⅱ)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173316-36380.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173316-74106.png)
=
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173317-13393.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173317-78174.png)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173317-42534.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173317-64012.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173318-15694.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173317-64012.png)
令
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173318-55818.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173318-60764.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173318-39740.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173319-33916.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173319-94469.png)
(Ⅲ)①若函数
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173319-63706.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173317-42534.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173319-81400.png)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173320-98039.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173319-81400.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173320-45677.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173319-81400.png)
令
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173318-55818.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173320-98990.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173315-98199.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173319-81400.png)
②若函数
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173319-63706.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173320-47566.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173319-81400.png)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173321-44320.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173319-81400.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173321-34715.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173321-21946.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173319-81400.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173321-28192.png)
故函数
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173319-63706.png)
综上可知,函数
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173319-63706.png)
解析
核心考点
试题【已知R,函数.(R,e为自然对数的底数)(Ⅰ)当时,求函数的单调递减区间;(Ⅱ)若函数内单调递减,求a的取值范围;(Ⅲ)函数是否为R上的单调函数,若是,求出a的】;主要考察你对导数的意义等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173250-38871.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173250-58019.png)
(Ⅰ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173250-66425.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173250-40964.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173250-83497.png)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173251-22411.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173251-78547.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173251-67319.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173251-33957.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173247-15569.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173247-24504.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173247-83393.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173247-15569.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173247-83393.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173242-71375.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173242-96372.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173242-37578.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173243-77257.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173243-26969.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173243-66942.png)
A.![]() | B.2 | C.4 | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173235-31200.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173235-43391.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173236-32464.png)
A.2 | B.![]() | C.![]() | D.![]() |
已知函数
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173203-35033.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173203-32599.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173203-15344.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173203-24272.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173204-78838.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173204-55113.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173204-39044.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173205-83521.png)
(2)若不等式
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173205-26740.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173205-38449.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173206-48456.png)
(3)若
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173206-59903.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173206-99354.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191017/20191017173206-48456.png)
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