题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072809-24491.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072809-34781.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072810-51096.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072810-44543.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072810-17558.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072810-52718.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072810-89413.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072811-15326.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072811-96183.png)
(Ⅰ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072810-44543.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072810-52718.png)
(Ⅱ)将数列
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072810-52718.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072811-52078.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072811-91668.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072812-26384.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072812-74493.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072812-36543.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072812-36543.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072812-20877.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072812-48574.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072813-65412.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072813-24531.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072813-88502.png)
解析
试题分析:解:(Ⅰ)根据题意,由于数列
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072809-34781.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072810-51096.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072810-44543.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072813-24678.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072810-52718.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072810-89413.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072811-15326.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072811-96183.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072814-25383.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072814-53516.png)
(Ⅱ)由题知将数列
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072810-52718.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072812-36543.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072814-54748.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072814-81419.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072814-81881.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072815-75582.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072815-98534.png)
点评:主要是考查了等差数列和等比数列的求和的运用,属于中档题。
核心考点
试题【已知,数列满足,数列满足;数列为公比大于的等比数列,且为方程的两个不相等的实根.(Ⅰ)求数列和数列的通项公式;(Ⅱ)将数列中的第项,第项,第项,……,第项,……】;主要考察你对等比数列等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072804-26729.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072804-50344.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072804-15835.png)
A.128 | B.-128 | C.256 | D.-256 |
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072747-47145.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072747-12695.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072747-92333.png)
(Ⅰ)记
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072747-36732.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072748-71090.png)
(Ⅱ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072748-16802.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072748-47357.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072748-77242.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072742-20444.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072743-81394.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072743-38090.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072743-48091.png)
.
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072739-12535.png)
A.127 | B.63 | C.15 | D.31 |
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