题目
题型:不详难度:来源:
设数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071634-94113.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071635-65270.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071635-14018.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071635-58741.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071635-54796.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071635-72676.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071636-95508.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071636-51280.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071636-26045.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071636-75588.gif)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071634-94113.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071635-54796.gif)
(2)记
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071637-70718.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071637-42360.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071637-20414.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071637-78834.gif)
答案
(1)由
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071637-14891.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071638-94136.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071638-93265.gif)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071638-74273.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071638-11302.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071639-42346.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071639-27785.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071639-40699.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071639-39885.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071639-84811.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071640-21127.gif)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071640-58918.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071640-90090.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071640-56017.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071641-90215.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071641-76566.gif)
同理可得当
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071641-72868.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071641-84329.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071641-72868.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071642-41836.gif)
因此
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071642-76887.gif)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071642-43070.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071642-86632.gif)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071641-72868.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071642-49564.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071643-38578.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071643-37913.gif)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071641-72868.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071642-49564.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071643-65609.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071643-14167.gif)
令
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071644-98632.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071644-97970.gif)
①
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071644-24581.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071644-77466.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071644-12861.gif)
①
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071645-18718.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071645-70732.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071645-77135.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071645-20020.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071638-11302.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071646-13079.gif)
因此
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071646-94920.gif)
解析
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071626-44497.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071626-37289.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071626-11811.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071627-26466.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071627-65219.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071626-37289.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071605-32189.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071605-77462.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071556-54390.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071556-75813.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071556-76551.gif)
A.40 | B.42 | C.43 | D.45 |
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071551-31930.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071551-41297.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013071552-26362.gif)
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