题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055443-75241.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055443-59505.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055444-19873.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055444-81914.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055444-14566.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055444-93491.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055444-26785.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055445-15015.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055445-25690.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055445-76138.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055445-98029.png)
解析
试题分析:(1)利用导数的几何意义求解(2)利用分组求和法求解
试题解析:(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055445-51049.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055443-59505.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055446-88178.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055446-16831.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055446-18086.png)
(2)由(1)知,
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055446-25788.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055447-90271.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055447-32611.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055447-82701.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055439-22474.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055439-20498.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055439-22474.png)
A.充分不必要条件 | B.必要不充分条件 |
C.充要条件 | D.既不充分也不必要条件 |
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055433-17896.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055433-98221.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055434-71174.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055434-11036.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055434-41516.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055434-10266.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055433-17896.png)
A.1 | B.2 | C.![]() | D.3 |
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055417-88310.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055417-71935.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055417-88310.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055417-36716.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055417-14630.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055417-60698.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055418-18401.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055340-71189.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055340-30673.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055341-33306.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055341-92335.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055341-70752.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055341-82739.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055342-41359.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055316-23616.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055316-98942.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055317-67823.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055317-31665.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055317-16672.png)
(1)证明:数列
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055316-23616.png)
(2)当
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055317-55061.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055317-83617.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055317-44871.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055317-10448.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055317-83617.png)
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