题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010044253-81472.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010044253-32873.png)
答案
解析
试题分析:由
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010044253-29083.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010044253-11089.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010044254-99067.png)
又因
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010044254-40341.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010044254-41939.png)
另解:
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010044254-70378.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010044255-93974.png)
点评:数列中的基本问题,往往要依据题意建立关于基本量的方程(组)。灵活运用数列的性质,往往能简化解题过程。
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010044206-10324.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010044206-34601.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010044206-10324.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010044212-53580.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010044206-10324.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010044212-53580.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010044212-53580.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010044212-57954.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010044223-41577.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010044212-57954.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010044155-79302.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010044155-11141.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010044156-30088.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010044155-79302.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010044156-90630.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010044156-12273.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010044155-11141.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010044156-50709.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010044157-73419.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010044155-11141.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010044051-93954.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010044051-95537.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010044051-29838.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010044052-16057.png)
A.![]() | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010044005-43706.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010044005-72877.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010044005-38457.png)
A.3 | B.![]() | C.4 | D.5 |
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043944-37812.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043945-11264.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043945-11191.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043945-61440.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010043946-42514.png)
A.40 | B.54 | C.80 | D.96 |
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