题目
题型:不详难度:来源:
已知
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223459-14987.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223500-26672.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223500-79740.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223500-62039.gif)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223500-11917.gif)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223501-71000.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223501-91563.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223501-32284.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223501-64062.gif)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223502-13408.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223502-17544.gif)
∴{
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223502-27862.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223502-12618.gif)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223503-13622.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223503-68868.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223503-96613.gif)
(2)∵数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223503-83910.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223503-72418.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223504-52181.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223504-67889.gif)
解析
核心考点
试题【(本题满分12分)已知成等差数列.又数列此数列的前n项的和Sn()对所有大于1的正整数n都有.(1)求数列的第n+1项;(2)若的等比中项,且Tn为{bn}的前】;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/20191012/20191012223453-62432.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223453-70670.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223453-22638.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223453-10761.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223453-42271.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223454-73375.gif)
A.![]() | B.![]() | C.![]() | D.4 |
已知数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223433-84972.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223434-78872.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223434-34669.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223434-98378.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223434-43060.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223434-42933.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223434-77392.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223435-83277.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223435-55287.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223435-31015.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223435-83277.gif)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223435-65910.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223436-15629.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223436-64920.gif)
(2)若对任意的
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223436-30084.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223436-24665.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223437-74634.gif)
(3)是否存在正整数
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223437-17417.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223437-37916.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223437-92415.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223437-17417.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223415-28600.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223416-46395.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223416-35965.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223416-28644.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223416-11448.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223416-77129.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223416-23977.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223417-32044.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223417-32876.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223417-91922.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223417-82137.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223417-95365.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223418-52288.gif)
A.4018 | B.4019 | C.4020 | D.4021 |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223410-75739.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223410-76477.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223410-71439.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223411-22570.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223410-75739.gif)
A.![]() ![]() | B.![]() ![]() | C.![]() ![]() | D.![]() ![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223403-92183.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223403-13727.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223403-65517.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223404-30267.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223404-97202.gif)
(文)等比数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223404-74426.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223404-27910.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223405-55298.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223405-16581.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223405-99048.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223406-52938.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223406-38176.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012223406-87322.gif)
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