题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034533-45342.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034533-56518.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034533-73571.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034533-70154.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034534-52714.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034534-18332.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034534-11939.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034534-75567.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034534-75567.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034534-61463.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034535-88590.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034535-30112.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034535-15123.gif)
(Ⅰ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034533-70154.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034534-18332.gif)
(Ⅱ)若数列{
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034535-99742.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034536-50755.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034536-50755.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034536-22211.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034536-87950.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034536-43050.jpg)
(2)112
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034536-83973.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034537-93939.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034537-56311.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034537-86160.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034537-87030.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034537-63995.gif)
又数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034538-53999.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034538-54792.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034538-12052.gif)
又公比
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034538-16273.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034539-80231.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034539-31961.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034539-91799.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034539-91760.gif)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034539-67303.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034540-48317.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034540-65331.gif)
数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034540-37458.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034540-91032.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034541-73664.gif)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034541-39398.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034541-66600.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034541-35127.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034539-31961.gif)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034541-27989.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034542-86712.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034542-40251.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034542-27731.gif)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034542-37468.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034542-52463.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034543-15681.gif)
核心考点
试题【(本题满分15分)已知点(1,)是函数且)的图象上一点,等比数列的前n项和为,数列的首项为c,且前n项和满足-=+(n2).(Ⅰ)求数列和的通项公式;(Ⅱ)若数】;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/20191013/20191013034523-99265.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034523-69856.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034523-92962.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034523-69856.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034523-92946.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034523-60594.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034524-97702.gif)
_____________.
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034524-45933.jpg)
设各项为正的数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034511-59002.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034511-21287.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034511-81143.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034511-74262.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034512-74521.gif)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034512-26218.gif)
(Ⅱ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034512-61542.gif)
(Ⅲ)设
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034512-93573.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034513-42678.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034513-76461.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034503-90173.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034503-39061.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034504-77904.png)
A.1 B.
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034504-98858.png)
( )
A.33 | B.72 | C.84 | D.189 |
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034454-23849.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034454-25855.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034454-15189.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034454-70810.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034454-99879.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013034454-23849.png)
A.是等差数列但不是等比数列 | B.是等比数列但不是等差数列 |
C.既是等差数列又是等比数列 | D.既不是等差数列又不是等比数列 |
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