题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020709-67328.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020709-60646.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020709-67328.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020709-60646.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020709-67052.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020709-50326.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020710-32978.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020710-27965.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020710-20867.png)
(1)求通项
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020710-29605.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020710-32978.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020710-71626.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020711-59354.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020711-63059.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020711-86079.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020709-50326.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020711-51524.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020712-60324.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020712-87419.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020712-18638.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020712-73697.png)
解析
试题分析:(1)先求出
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020712-99917.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020709-67328.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020709-60646.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020709-67328.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020709-60646.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020710-29605.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020710-32978.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020710-71626.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020711-86079.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020711-86079.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020711-86079.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020709-50326.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020711-51524.png)
试题解析:(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020713-54159.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020710-27965.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020713-96705.png)
于是有
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020713-82031.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020713-72125.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020713-96543.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020714-61004.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020714-82922.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020714-99412.png)
(2)由题意知
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020714-62387.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020714-88060.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020709-50326.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020659-64195.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020659-10283.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020659-19351.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020647-18955.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020626-25018.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020627-70982.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020627-32204.png)
(I)求数列{
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020626-25018.png)
(II)若数列{
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020627-53701.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020627-71328.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020633-47205.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020627-53701.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020634-68900.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020634-74836.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020608-75387.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020608-41634.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020608-88101.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020609-73414.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020609-64106.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020609-44759.png)
(1)证明:设
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020610-18415.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020610-44226.png)
(2)求
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020610-52455.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020610-39759.png)
(3)判断数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020608-75387.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020544-23858.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020545-24545.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020545-59667.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020545-68071.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020545-80857.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020545-96074.png)
(Ⅰ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020552-48669.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020545-80857.png)
(Ⅱ)设数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020552-91523.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020552-88096.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020552-98005.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020553-80916.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020553-79469.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012020553-16363.png)
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