题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074814-18677.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074815-14422.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074815-54396.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074815-23626.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074815-42971.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074814-18677.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074815-60896.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074815-67046.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074816-59422.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074816-67335.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074816-50725.png)
解析
试题分析:(1)由题意,
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074816-79024.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074817-17102.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074817-90328.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074817-83105.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074817-55203.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074818-72287.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074814-18677.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074816-67335.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074818-23256.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074818-48940.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074818-17356.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074819-97657.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074819-80382.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074819-43198.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074819-94107.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074815-14422.png)
点评:由
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074819-43198.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074819-94107.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074819-69532.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074806-22328.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074806-91804.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074806-88569.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074806-13013.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074807-20567.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074807-19961.png)
(I)求等比数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074806-13013.png)
(II)设等差数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074807-14440.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074807-58231.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074808-86886.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074807-14440.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074808-20070.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074808-94520.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074748-40026.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074748-83502.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074748-68629.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074749-61030.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074749-35527.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074749-92677.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074749-66445.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074722-34387.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074723-27851.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074723-27851.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074723-84253.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074723-71800.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074722-34387.png)
(2)若数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074723-45677.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074724-11129.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074724-52537.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074724-65109.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074723-84253.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074723-45677.png)
(3)设
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074724-15405.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074724-24616.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074723-71800.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074725-68941.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074705-97457.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074705-22968.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074705-45930.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074705-97457.png)
数
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074705-22968.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074705-97457.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074705-22968.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074705-45930.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074705-97457.png)
正整数
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074705-22968.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074705-38829.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074706-92524.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074706-92524.png)
值为
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074653-43331.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074653-97315.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074653-91170.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074653-55468.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012074654-12060.png)
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