题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045616-45895.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045616-55206.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045617-13210.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045616-45895.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045617-50168.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045617-72054.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045617-50168.png)
(Ⅱ)令bn=
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045617-87627.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045618-91074.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045618-78684.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045618-36345.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045617-72054.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045618-27019.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045617-50168.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045618-92922.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045619-70276.png)
解析
试题分析:(Ⅰ)由
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045616-55206.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045617-13210.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045619-81341.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045617-72054.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045618-27019.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045617-50168.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045618-92922.png)
(Ⅱ)由
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045617-72054.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045618-27019.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045617-87627.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045619-64691.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045619-55960.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045618-36345.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045620-91080.png)
点评:等差数列通项
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045620-95594.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045620-25861.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045620-34951.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045552-23425.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045552-95401.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045552-60802.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045553-58281.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045553-54693.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045553-84807.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045553-46377.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045554-24620.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045554-28107.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045554-86101.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045554-76009.png)
(3)设
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045555-68802.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045555-53299.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045555-74909.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045554-86101.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045555-25116.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045554-86101.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045555-26632.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045544-27702.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045545-10981.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045545-35288.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045519-92082.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045519-78236.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045519-79469.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045452-13185.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045452-66407.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045452-16716.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012045453-36421.png)
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