题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103742-49455.png)
(1)求证{1+
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103742-49455.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103742-49455.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103743-66085.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103743-95204.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103743-34263.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103743-54760.png)
解析
(1)利用前n项和与通项公式的关系,对于n令值,当n=1,n》2时,分别讨论得到其通项公式结论
(2)由上一问知道
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103744-14509.png)
解:⑴由已知:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103744-92743.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103744-16225.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103744-67696.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103745-36876.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103745-70428.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103745-26160.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103745-46927.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103745-84103.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103746-84812.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103746-60066.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103746-74389.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103746-83946.png)
即数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103747-59049.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103747-28979.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103747-21519.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103743-34263.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103747-30834.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103747-76570.png)
核心考点
试题【(12分)已知数列{}的首项a1=5,前n项和为Sn,且Sn+1=2Sn+n+5(1)求证{1+}为等比数列,并求数列{}的通项公式;(2)是数列{}前n项和,】;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/20191012/20191012103727-89096.png)
A.![]() | B.![]() | C.![]() | D.以上答案都不对 |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103721-55684.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103721-67600.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103715-24471.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103715-61952.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103715-96216.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103715-75120.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103716-24638.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103703-60467.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103703-94715.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103704-47059.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103704-14945.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103703-60467.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103703-94715.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103704-41740.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103704-26347.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103704-31089.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103651-25304.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103652-97625.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103652-12549.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103652-29351.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103652-68967.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103653-23569.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103653-17305.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103653-26653.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103653-84369.png)
(Ⅰ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103651-25304.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103653-23569.png)
(Ⅱ)设数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103651-25304.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103653-17305.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103654-51110.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103654-97640.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103654-77606.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103654-75454.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012103655-97026.png)
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