题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082313-35930.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082313-24770.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082313-35930.png)
A.180 | B.405 | C.450 | D.810 |
答案
解析
试题分析:因为数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082313-35930.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082313-32437.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082314-75161.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082314-21769.png)
数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082313-35930.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082314-43746.png)
故选D.
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082314-61663.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082245-82054.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082245-57866.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082246-55842.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082245-82054.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082246-61060.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082246-95644.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082246-73364.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082246-73364.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082247-87737.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082247-43218.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082213-98098.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082213-82791.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082213-99654.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082213-37223.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082213-98098.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082213-57016.png)
(2)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082213-98098.png)
(3)设
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082214-86014.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082214-22497.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082214-62818.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082213-82791.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082214-41761.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082215-26963.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082215-86750.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082145-78988.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082145-28253.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082146-73896.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082146-26024.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082146-21280.png)
(I)求
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082145-78988.png)
(II)设
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082146-61448.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082146-25360.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082147-19406.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082147-78512.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082054-90188.png)
A.13 | B.26 | C.52 | D.156 |
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082004-85661.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082004-60352.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082004-97787.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082004-90967.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009082005-52579.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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