题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009194615-97215.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009194615-85779.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009194615-63950.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009194616-39085.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009194616-70114.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009194616-71404.png)
(Ⅰ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009194615-97215.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009194616-10310.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009194617-24992.png)
(Ⅱ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009194616-39085.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009194617-30956.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009194617-36736.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009194617-70650.png)
解析
试题分析:解:(I)设
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009194618-43974.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009194618-18170.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009194618-90563.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009194617-30956.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009194617-36736.png)
(II)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009194618-89536.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009194619-64384.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009194619-73033.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009194619-59729.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009194619-19773.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009194620-13508.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009194620-50706.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009194620-24484.png)
所以数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009194616-39085.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009194617-70650.png)
点评:主要是考查了等差数列的通项公式和求和的运用,属于基础题。
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009194202-94843.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009194202-94843.png)
(2)若从数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009194202-94843.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009194202-90411.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009194202-68932.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009194202-68932.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009194150-30533.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009194150-53660.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009194151-23292.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009194151-82038.png)
(3)是否存在正整数M,使得
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009194151-43857.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009193759-15965.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009193800-48102.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009193800-66828.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009193800-48102.png)
A.1 | B.2 | C.±1 | D.±2 |
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009193709-13777.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009193710-62573.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009193710-13830.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009193710-75535.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009193710-43514.png)
(Ⅰ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009193709-13777.png)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009193711-55151.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009193711-74901.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009193711-61517.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009193711-78290.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009193712-17160.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009193712-99149.png)
成立,求实数
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009193712-97547.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009193457-34484.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009193457-98479.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009193457-34484.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009193458-86344.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009193458-49961.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009193458-49871.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009193457-34484.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009193458-49961.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009193459-41296.png)
(1)已知数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009193457-34484.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009193459-74816.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009193457-98479.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009193459-29973.png)
(2)若数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009193457-34484.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009193459-68462.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009193500-93306.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009193457-34484.png)
(3)对(2)中数列
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009193457-34484.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009193501-43145.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009193501-71657.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009193501-38840.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191009/20191009193501-43145.png)
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