题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113312-29510.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113312-56775.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113312-26705.png)
A.20 | B.21 | C.22 | D.23 |
答案
解析
试题分析:因为等差数列的前n项和公式
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113312-52486.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113312-61191.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113313-96016.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113313-30095.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113313-91432.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113249-51241.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113249-71790.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113249-70788.png)
A.49 | B.50 | C.99 | D.100 |
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113138-50586.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113139-66064.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113138-50586.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113139-31125.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113139-36207.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113139-34271.png)
(Ⅰ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113138-50586.png)
(Ⅱ)令
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113140-58007.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113140-97703.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113139-31125.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113140-88782.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113131-41424.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113131-68505.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113131-98704.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113132-82958.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009113132-35868.png)
A.3 | B.5 | C.8 | D.15 |
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009112951-25190.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009112952-92822.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009112952-80219.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009112928-68290.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009112928-86088.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009112928-25362.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009112928-68290.png)
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