题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035255-85012.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035256-10009.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035256-59148.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035256-19069.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035256-29450.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035257-10576.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035257-45648.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035257-42996.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035257-23867.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035257-95557.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035256-10009.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035256-19069.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035258-41623.gif)
如:
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035258-30486.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035258-66010.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035258-11785.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035259-80467.jpg)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035259-20503.gif)
解析
核心考点
试题【用三个字母组成一个长度为个字母的字符串,要求由开始,相邻两个字母不同. 例如时,排出的字符串可能是或;时排出的字符串可能是(如图).若记长度为个字母的字符串中,】;主要考察你对等差数列等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035221-53723.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035221-71020.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035221-56575.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035221-16498.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035221-56575.gif)
n项和为
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035222-13263.gif)
(1) 求
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035222-93989.gif)
(2) 求证:数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035222-18585.gif)
(3) 抽去数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035221-53723.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035222-94267.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035222-94267.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035223-32998.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035223-20035.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035212-34105.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035212-23928.gif)
(1) 求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035212-95552.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035212-36852.gif)
(2) 求
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035212-25823.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035207-46151.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035207-91325.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035207-93669.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035208-37014.gif)
那么
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035208-53653.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035144-44934.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035145-17595.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035145-93941.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035145-54662.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035145-40504.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035145-68634.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035146-25345.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035146-30841.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035146-56655.gif)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035133-87634.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035133-14063.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035133-22438.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035133-87634.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013035134-60358.gif)
A.1340 | B.1338 | C.670 | D.669 |
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