题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072838-21840.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072838-96484.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072838-50724.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072838-86663.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072839-70553.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072838-50724.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072839-47611.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072839-78074.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072839-90566.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072840-67236.png)
解析
试题分析:解:
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072840-57887.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072840-53930.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072840-10180.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072840-36039.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072839-47611.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072839-78074.png)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072841-19749.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072839-90566.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072840-67236.png)
点评:主要是考查了等比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/20191014/20191014072821-94153.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072821-59911.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072821-70393.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072821-15516.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072821-73971.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072822-60723.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072822-66970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072822-66883.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072822-76907.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072823-99865.png)
(Ⅰ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072821-70393.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072823-26412.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072823-30986.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072823-30986.png)
(Ⅲ)令
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072823-14828.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072824-63413.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072824-31188.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014072824-46819.png)
![](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)
![](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)
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