题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008210016-17532.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008210016-70434.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008210016-44469.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008210016-83677.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008210017-57688.png)
(2)在等比数列
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008210016-70434.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008210017-29080.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008210017-17190.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008210017-73577.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008210017-34125.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008210018-53509.png)
解析
试题分析:(1)此题为基本量法的习题,
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008210018-31165.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008210018-52873.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008210018-80253.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008210017-17190.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008210019-11663.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008210017-57688.png)
(2)也是先设基本量首项与公比,
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008210019-86673.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008210019-47969.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008210017-17190.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008210017-73577.png)
解:(1)由题意知:
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008210019-17146.png)
(2)由题意知:
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008210020-91370.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008205809-81220.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008205810-83387.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008205810-12437.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008205554-26132.png)
个数
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008205555-89700.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008205555-50501.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008205555-44026.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008205555-34296.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008205556-53445.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008205556-15468.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008205556-42138.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008205556-26874.png)
(2)求第
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008205557-11605.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008205557-79340.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008205513-31138.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008205514-57220.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008205514-18836.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008205514-65873.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008205514-82149.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008205513-31138.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008205514-65873.png)
(2)设数列
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008205514-23866.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008205515-89891.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008205515-41002.png)
(1) 若当n=10时,Sn取到最小值,求
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008205345-52176.png)
(2) 证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008205345-82464.png)
(1)求数列{an}的通项公式;
(2)若数列{an}和数列{bn}满足等式:
an-1=
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008205047-46914.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008205047-77968.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008205047-82060.png)
设数列{bn}的前
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008205047-82060.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191008/20191008205048-73840.png)
求Tn的最小值
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