题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084334-48885.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084335-74240.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084335-94905.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084335-83603.png)
(1)试求
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084334-48885.png)
(2)若数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084335-40481.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084336-78595.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084335-40481.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084335-74240.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084336-28944.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084336-39630.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084336-36808.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084337-42595.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084337-29773.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084337-67079.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084337-36351.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084336-39630.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084338-55161.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084328-43583.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084328-25813.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084328-32644.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084329-66933.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084328-32644.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084304-89809.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084304-94927.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084304-38188.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084305-68071.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084304-94927.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084305-85712.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084311-57156.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084311-58644.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084312-43722.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084304-94927.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084312-16867.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084304-94927.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084312-16867.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084312-16867.png)
已知正项等差数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084239-67719.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084239-79728.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084239-16846.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084239-50585.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084239-59607.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084239-67719.png)
(2)记
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084240-62041.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084239-79728.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084240-54665.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084240-27188.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084221-53178.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084221-37592.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084221-21809.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084222-36280.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084222-64205.png)
(Ⅰ)若{
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084222-93453.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084222-20094.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084222-64205.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084223-11615.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084223-13705.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084223-73673.png)
(Ⅱ)设数列{
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084223-13933.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084223-86743.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084224-68607.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084222-36280.png)
(Ⅲ)设数列{
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084224-73837.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084224-84664.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084224-97138.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084215-22630.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084216-11791.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084216-46208.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084216-97100.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084217-11827.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084217-42613.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084217-83546.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084217-64238.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012084217-47542.png)
A.55 | B.70 | C.85 | D.100 |
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