题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042757-19855.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042758-62662.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042757-19855.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042758-60673.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042758-97506.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042758-85362.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042759-18617.png)
解析
试题分析:(Ⅰ)当
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042759-78284.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042759-16533.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042759-28744.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042800-58571.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042800-87667.png)
①-②得
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042800-24666.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042758-85362.png)
经验证
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042759-78284.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042758-85362.png)
(Ⅱ)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042800-22587.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042800-46640.png)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042801-15117.png)
因此
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042758-97506.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042801-61901.png)
点评:通项公式及前n 项和的求解是数列的最基础的考查,是高考中的基础试题,对学生的要求是熟练掌握公式,并能进行一些基本运算.
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042751-61841.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042751-23530.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042751-80251.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042752-66744.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042751-61841.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042752-48390.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042752-23316.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042752-31527.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042751-61841.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042752-23316.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042753-93887.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042737-42354.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042737-72653.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042737-71497.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042738-81993.png)
列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042738-21226.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042738-78748.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042738-12354.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042739-81714.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042727-14636.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042728-90641.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042728-67745.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042728-67933.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042728-90641.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042728-67745.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042728-67933.png)
| 第一列 | 第二列 | 第三列 |
第一行 | 3 | 2 | 10 |
第二行 | 6 | 4 | 14 |
第三行 | 9 | 8 | 18 |
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042727-14636.png)
(Ⅱ)若数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042728-35652.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042729-43488.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042728-35652.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042729-16147.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042729-83389.png)
已知
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042717-59725.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042717-62229.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042717-58613.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042717-12183.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042717-87980.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042717-59725.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042717-62229.png)
(Ⅱ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042718-85480.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042718-78705.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042718-37528.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042718-42991.png)
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