题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012113203-78754.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012113203-36879.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012113203-78754.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012113204-36135.png)
A.7 | B.15 | C.20 | D.25 |
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012113204-84731.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012113204-64181.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012113204-88418.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012113204-12066.png)
【考点定位】本题考查等差数列的通项公式及前n项和公式,解题时要认真审题,仔细解答
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012113123-12971.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012113124-56503.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012113124-27870.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012113124-18615.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012113124-14192.png)
(Ⅰ)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012113123-12971.png)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012113125-19317.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012113125-13193.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012113114-28335.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012113115-42991.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012113115-30202.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012113115-50864.png)
A.200 | B.201 | C.400![]() | D.402 |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012113100-46043.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012113100-20061.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012113101-73755.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012113101-45122.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012113052-15777.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012113052-21436.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012113052-51924.png)
(1)证明数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012113052-14670.png)
(2)求所有正整数
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012113053-14740.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012113052-14670.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012113053-14740.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012113052-15777.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012113042-44431.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012113042-59741.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012113043-23754.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012113043-72118.png)
A.99 | B.49 | C.101 | D.102 |
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