题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190208-27884.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190209-66531.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190209-27655.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190209-82286.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190209-28163.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190210-25478.png)
且
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190210-55572.png)
(1)求数列{
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190208-27884.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190209-66531.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190210-75124.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190208-27884.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190209-66531.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190209-27655.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190210-75124.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190211-95347.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190211-46385.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190211-10839.png)
解析
试题分析:(1)根据公式
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190211-46499.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190212-98081.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190212-91150.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190212-96073.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190213-60038.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190213-45463.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190209-66531.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190213-72125.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190213-72125.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190214-23280.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190214-85573.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190214-46336.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190208-27884.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190210-75124.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190210-75124.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190212-96073.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190213-60038.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190209-27655.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190210-75124.png)
解(1)由
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190209-28163.png)
知当
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190209-27655.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190214-50194.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190215-15970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190215-39279.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190209-27655.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190215-56959.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190216-50052.png)
(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190216-30358.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190216-63519.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190216-20522.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190217-10169.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190215-15970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190217-64161.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190215-15970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190212-91150.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190209-27655.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190215-56959.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190215-15970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190217-38407.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190213-60038.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190213-60038.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190215-15970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190211-95347.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190215-15970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190218-66701.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190215-15970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190218-81816.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190215-15970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190218-20693.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190215-15970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190218-84864.png)
故
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190219-97295.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190216-20522.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190208-27884.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190209-66531.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190219-66266.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190215-15970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190219-59989.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190219-92642.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190220-12652.png)
①
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190216-30358.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190220-60828.png)
=
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190220-39141.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190215-15970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190211-10839.png)
核心考点
举一反三
A.1 | B.2 | C.3 | D.4 |
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190045-28861.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190045-79568.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190045-28861.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190045-96340.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190046-54154.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011190046-50771.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011185933-46802.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011185934-52912.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011185934-68262.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011185919-73398.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011185920-78267.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011185920-40147.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011185919-73398.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011185235-96694.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011185235-80242.png)
(1)求证:数列
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011185236-23238.png)
(2)令bn=
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011185236-83899.png)
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