题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125410-87130.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125410-62505.png)
(Ⅰ)若函数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125410-91768.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125410-40027.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125410-53360.png)
(Ⅱ)令
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125410-70394.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125410-53360.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125411-29807.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125411-29328.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125411-47186.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125411-79130.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125410-53360.png)
(III)当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125411-29807.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125411-29328.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125412-55616.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125412-68369.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125410-40027.png)
令
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125412-92140.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125412-65357.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125412-69730.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125413-20333.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125413-27504.png)
③当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125413-95494.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125411-79130.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125413-64802.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125414-52654.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125414-59061.png)
综上,存在实数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125414-70717.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125414-17471.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125414-59392.png)
(III)令
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125415-14170.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125415-41021.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125415-49582.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125415-58195.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125416-68056.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125416-38720.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125416-31144.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125413-64802.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125416-55186.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125416-91226.png)
即
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125417-22913.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125417-85213.png)
解析
核心考点
试题【(本题满分13分)已知函数, (Ⅰ)若函数在上是减函数,求实数的取值范围;(Ⅱ)令,是否存在实数,当(是自然常数)时,函数的最小值是3,若存在,求出的值;若不存】;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/20191018/20191018125359-78986.png)
(1)若曲线
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125359-48980.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125359-32382.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125359-58613.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125359-48980.png)
(2)若对
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125359-31687.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125359-78665.png)
(3)记
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125400-26690.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125400-92900.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125400-20927.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125336-42533.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125336-82922.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125336-89319.png)
(I)讨论函数
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125337-91034.png)
(Ⅱ)当
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125337-16886.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125337-91034.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125337-69519.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125336-89319.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125319-39656.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125319-42997.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125320-42220.png)
是
A.![]() | B.![]() | C.![]() | D.![]() |
(1) 求函数f(x)的单调区间和最小值;
(2)当b>0时,求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125311-61829.png)
(3)若a>0,b>0, 求证:f(a)+(a+
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125311-84137.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125254-79461.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125254-96794.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125254-57394.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125254-57698.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125255-65909.png)
(Ⅱ)设
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125255-39698.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191018/20191018125255-88907.png)
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