题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012111-10926.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012111-36961.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012112-26957.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012112-20742.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012112-26957.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012112-20742.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012112-20742.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012112-99640.gif)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012112-54826.gif)
(2)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012111-10926.gif)
答案
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012113-63063.gif)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012113-78144.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012113-41535.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012113-47806.gif)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012112-54826.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012113-28363.gif)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012114-71984.gif)
当n=1时,a1=3,当n≥2时,an=S
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012114-42367.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012114-67690.gif)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012052-39045.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012052-52558.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012053-65407.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012053-69055.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012052-39045.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012053-75234.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012053-12276.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012053-46440.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012054-76226.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012054-20619.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012037-79623.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012038-77471.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012038-10608.gif)
(1)、当
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012038-78476.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012038-36972.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012039-62712.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012039-15269.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012039-74812.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012039-40982.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012039-74780.gif)
(2)、当
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012040-90933.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012040-59575.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012040-55189.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012031-21854.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012031-10969.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012031-55127.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012031-39501.gif)
A.10 | B.20 | C.25 | D.30 |
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012020-15156.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012020-62021.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012021-99549.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012021-96789.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012021-18651.gif)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012020-15156.gif)
(Ⅱ)若数列
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012021-46277.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012021-55810.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012021-25453.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012022-93009.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012022-97187.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012020-62021.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012022-87735.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012015-63931.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191013/20191013012015-17582.gif)
A.18 | B.17 | C.16 | D.15 |
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