题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065851-65683.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065851-44351.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065851-92475.png)
A.![]() | B.![]() | C.![]() | D.![]() |
答案
解析
试题分析:因为
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065851-44351.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065852-49405.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065851-92475.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065852-44513.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065852-90220.png)
点评:裂项相消法和错位相减法是数列求和的常用方法,正确应用裂项相消法的关键是正确裂项.
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065839-72354.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065840-21359.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065806-25933.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065806-15950.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065807-60480.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065807-26311.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065807-17399.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065743-48767.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065743-81412.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065743-79129.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065743-69288.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065744-39046.png)
(Ⅰ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065743-48767.png)
(Ⅱ)设
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065744-62797.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065744-73433.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065743-81412.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065744-60839.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065727-37394.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065727-93362.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065727-71681.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065727-71681.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065728-58509.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065738-23983.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065727-71681.png)
已知有穷数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065704-81681.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065705-22022.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065705-51600.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065705-87075.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065705-58943.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065706-37732.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065706-48527.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065706-62330.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065704-81681.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065706-64475.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065707-22466.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065707-56653.png)
求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065707-37545.png)
⑶若⑵中数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065707-22466.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065707-35241.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012065718-30754.png)
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