题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009225818-70654.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009225818-81716.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009225819-45969.png)
A.![]() | B.![]() | C.![]() | D.![]() |
答案
解析
试题分析:根据题意,由于等差数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009225818-70654.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009225818-81716.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009225820-22154.png)
点评:本试题主要是考查了等差数列和等比数列的通项公式的运用,属于基础题。
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009225719-46673.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009225720-15379.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009225720-70795.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009225720-52472.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009225720-53155.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009225721-83637.png)
A.17 | B.18 | C.19 | D.20 |
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009225636-57957.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009225636-99302.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009225636-38635.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009225622-94829.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009225623-44182.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009225623-78159.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009225623-17527.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009225623-50763.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009225622-94829.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009225624-16613.png)
(2)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009225624-54684.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009225624-27869.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009225514-73128.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009225514-70578.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009225514-20447.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009225514-83703.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009225515-59683.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009225515-76582.png)
(1)证明{
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009225515-59899.png)
(2)求
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009225515-37354.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009225514-20447.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009225418-33087.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009225418-81319.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009225419-56997.png)
(1)求证数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009225419-19065.png)
(2)求
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009225419-55184.png)
(3)数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009225419-48750.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009225420-88780.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009225420-93170.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009225420-50190.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009225420-73554.png)
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