题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035912-82482.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035912-44882.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035912-12077.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035913-36742.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035913-74957.png)
解析
试题分析:因为,
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035912-44882.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035912-12077.png)
所以,
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035913-63882.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035912-82482.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035913-36742.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035913-74957.png)
点评:简单题,此类问题的一般解法,是考察数列的前几项,发现数列的周期性。
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035900-79015.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035901-24136.png)
(1)设
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035901-18519.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035901-79330.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035901-55274.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035902-43343.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035902-22234.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035902-41515.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035902-95973.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035846-83201.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035846-20832.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035846-64066.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035846-60465.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035847-56273.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035847-16722.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035846-83201.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035836-11750.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035836-85695.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035836-85325.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035837-36830.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035830-33944.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035830-53803.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035831-31722.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035831-38860.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035831-96084.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035831-77142.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035831-39423.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035832-24435.png)
A.80 | B.160 | C.320 | D.640 |
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035823-68346.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035823-13343.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035823-16157.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035823-38078.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035824-85717.png)
(1)求
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035824-16719.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035824-25082.png)
(2)证明:数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035824-19114.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035823-68346.png)
(3)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035823-68346.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035825-19525.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015035825-74572.png)
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