题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065653-89353.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065653-95767.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065653-17808.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065654-34917.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065654-77666.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065654-73299.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065654-61708.png)
(3)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065654-67302.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065653-95767.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065655-55612.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065655-82407.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065655-61311.png)
解析
试题分析:(1)只要把
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065653-17808.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065655-93461.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065654-34917.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065654-77666.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065653-17808.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065655-93461.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065656-51919.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065656-15554.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065656-20149.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065654-67302.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065656-51520.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065656-81633.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065655-93461.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065657-42625.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065657-89029.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065657-16355.png)
试题解析:(1)由已知
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065657-28656.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065657-17882.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065658-23606.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065658-68284.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065653-17808.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065656-20149.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065658-40859.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065658-27836.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065659-30288.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065659-58515.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065659-52427.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065659-22153.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065700-41353.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065659-30288.png)
(3)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065657-42625.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065700-41780.png)
相减得
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065700-17920.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065700-49162.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065701-66698.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065627-48846.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065627-63731.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065627-64142.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065628-17582.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065628-84322.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065628-59506.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065628-39070.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065629-81871.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065629-37127.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065628-84322.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065629-35700.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065629-35700.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065629-63165.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065629-44976.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065630-83587.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065630-17915.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065628-17582.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065628-39070.png)
(2)求数列{
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065630-59179.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065628-84322.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065630-30940.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065630-30940.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065630-96337.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065628-84322.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065620-91331.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065620-76942.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065620-85109.png)
A.8 | B.10 | C.12 | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065615-54910.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065615-22112.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065615-84381.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065616-48598.png)
A.85 | B.225 | C.15 | D.7225 |
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065604-61836.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014065558-34942.png)
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