题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042245-73098.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042246-33475.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042246-51748.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042246-39418.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042246-27488.png)
答案
解析
试题分析:
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042247-79058.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042247-57731.png)
由求和公式
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042247-35624.png)
点评:常用的求和公式
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042247-95500.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042247-96107.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042248-59623.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042234-31869.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042234-58821.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042234-15637.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042234-31869.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042235-87348.png)
A.2 | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042227-36913.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042227-97170.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042227-66028.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042227-62680.png)
设
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042217-52038.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042218-45927.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042218-53410.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042218-44440.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042218-48749.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042217-52038.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042218-45927.png)
(Ⅱ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042219-98599.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042219-93946.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042208-19755.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042208-84401.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042208-25568.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042208-12062.png)
A. 2个 | B. 6个 | C. 8个 | D. 16个 |
在数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042149-57357.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042149-77819.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042149-68789.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042149-33559.png)
(1)若
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042149-46450.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042149-57357.png)
(2)若数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042150-23531.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015042149-77819.png)
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