题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101225-56830.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101225-51690.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101225-52723.png)
A.![]() | B.![]() | C.![]() | D.![]() |
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101225-56830.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101225-51690.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101227-58512.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101217-78366.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101217-89377.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101218-79431.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101218-42949.png)
(Ⅰ)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101217-78366.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101218-11406.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101217-89377.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101218-94603.png)
(Ⅱ)设
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101219-57239.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101219-31854.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101219-96654.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101219-21065.png)
已知公差不为零的等差数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101154-59209.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101154-14756.png)
(Ⅰ)求通项公式
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101154-37357.png)
(Ⅱ)设
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101155-43854.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101155-53651.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101155-93441.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101155-72481.png)
设等差数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101135-75209.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101136-33651.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101136-40666.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101136-75939.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101136-33651.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101136-70672.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101136-63386.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101137-49700.png)
(Ⅰ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101135-75209.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101136-75939.png)
(Ⅱ)求和:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101137-66767.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101131-78823.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101131-45621.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101131-20869.png)
A.7 | B.8 | C.15 | D.17 |
在等差数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101106-76530.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101107-25560.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101107-40284.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101107-32981.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101107-30732.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101108-99132.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101108-20855.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101108-85785.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101108-60325.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101108-95939.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101109-49976.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101109-98698.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101109-30708.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101109-97486.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101107-40284.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012101110-53398.png)
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