题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091103-90071.png)
(1)当a=l时,求
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091103-47384.png)
(2)若函数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091103-47384.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091103-59899.png)
(3)令
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091103-55930.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091104-30838.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091104-13120.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091104-85466.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091104-78736.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091104-81803.png)
解析
试题分析:(1)把
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091105-27095.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091105-11685.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091105-24764.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091105-48630.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091106-93420.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091106-39771.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091106-28283.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091106-28283.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091103-59899.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091106-18116.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091107-21756.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091107-14851.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091107-71905.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091108-16165.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091108-45207.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091108-17275.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091108-44351.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091108-82548.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091109-35431.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091109-27184.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091109-10690.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091109-23806.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091110-79635.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091108-45207.png)
(1)当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091105-27095.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091110-81641.png)
因为函数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091105-11685.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091105-24764.png)
所以当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091110-13878.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091106-93420.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091110-27020.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091106-39771.png)
所以函数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091106-28283.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091104-13120.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091104-85466.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091106-18116.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091107-21756.png)
令
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091107-71905.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091108-16165.png)
得
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091111-41540.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091111-59809.png)
(3)假设存在实数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091108-45207.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091108-17275.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091108-44351.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091111-47859.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091111-44661.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091109-10690.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091111-45276.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091112-26595.png)
②当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091109-23806.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091111-44661.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091112-26464.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091112-62371.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091112-28280.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091104-81803.png)
③当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091113-41229.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091111-44661.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091109-10690.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091111-45276.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091112-26595.png)
综上,存在实数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091104-81803.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091113-11002.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091106-28283.png)
核心考点
试题【已知函数.(1)当a=l时,求的单调区间;(2)若函数在上是减函数,求实数a的取值范围;(3)令,是否存在实数a,当(e是自然对数的底数)时,函数g(x)最小值】;主要考察你对函数的单调性与导数等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091045-56085.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091045-48771.png)
(1)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091046-25517.png)
(2)记曲线
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091046-55385.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091046-92252.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091046-90884.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091046-55796.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091046-55796.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091047-77246.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091047-10052.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091047-39887.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091047-39887.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091034-68898.png)
①过原点;②在
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091034-21883.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091034-71096.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091035-59854.png)
(1) 求实数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091035-88973.png)
(2)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091034-68898.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091003-45543.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091003-31880.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091004-85429.png)
(2)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091004-91677.png)
(3)设函数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091004-12421.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091004-56571.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091005-49155.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018091005-67950.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018090946-54165.png)
(1)当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018090947-23510.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018090947-31140.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018090947-44336.png)
(2)求函数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018090947-69962.png)
(3)若对任意的
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018090947-74479.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018090948-63464.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018090948-64924.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018090938-12496.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018090938-68792.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018090938-35317.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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