题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040136-75817.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040136-11164.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040136-94837.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040136-96240.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040136-49521.png)
A.10 | B.12 |
C.15 | D.30 |
答案
解析
解:设公差为d,首项为
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040137-40054.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040137-43524.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040137-92478.png)
所以,
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040137-74780.png)
答案:C.
核心考点
举一反三
对于各项均为整数的数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040121-33942.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040121-48343.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040121-91533.gif)
列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040121-33942.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040122-12770.gif)
不论数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040121-33942.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040122-55629.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040122-12770.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040121-33942.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040122-83635.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040122-83635.gif)
时满足下面两个条件:①
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040122-51439.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040122-86507.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040123-82918.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040122-83635.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040122-12770.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040121-33942.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040122-12770.gif)
(I)设数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040121-33942.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040123-56456.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040123-41689.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040121-33942.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040122-12770.gif)
(II)试判断数列1,2,3,4,5和数列1,2,3,…,11是否具有“变换
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040122-12770.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040122-83635.gif)
(III)对于有限项数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040123-82251.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040123-56456.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040124-82751.gif)
数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040123-82251.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040122-12770.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040124-82737.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040124-52162.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040123-82251.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040122-12770.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040115-52793.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040115-89974.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040115-46259.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040115-61616.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040116-85640.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040116-23321.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040108-25965.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040108-87913.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040109-57986.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040109-75474.gif)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040109-10508.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040109-31405.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040109-39452.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040110-93283.gif)
(Ⅱ)用数学归纳法证明所得的结论。
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040054-84356.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040054-79041.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040054-99109.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040055-50592.gif)
A.2 | B.3 | C.6 | D.7 |
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040049-32614.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040049-99917.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040049-61614.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040049-41700.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040050-63979.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013040050-12166.gif)
A.![]() | B.![]() | C.![]() | D.![]() |
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