题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009020203-20685.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009020203-80909.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009020203-40736.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009020203-62596.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009020204-65706.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009020204-27324.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009020204-92393.png)
答案
解析
试题分析:设等差数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009020203-20685.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009020204-56803.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009020205-84667.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009020204-56803.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009020205-16800.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009020203-80909.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009020133-99474.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009020133-67486.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009020134-96320.png)
A.8 | B.21 | C.28 | D.35 |
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009020123-11619.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009020124-14991.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009020124-29282.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009020124-59698.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009020124-80498.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009020124-70766.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009020125-91181.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009020112-98630.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009020112-96483.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009020113-91461.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015951-79467.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015952-69987.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015952-65085.png)
⑴求
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015952-97941.png)
⑵设
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015952-77111.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015953-65375.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015952-97941.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015952-77111.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015953-48490.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015953-36726.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015926-67441.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015927-16816.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015927-15198.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015927-49847.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015927-34017.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015928-42469.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015928-66605.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015927-49847.png)
(2)求
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009015926-67441.png)
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