题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055256-19448.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055257-47740.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055257-82655.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055257-71419.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055256-19448.png)
(2)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055257-30524.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055257-47740.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055257-43549.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055258-68800.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055258-77204.png)
解析
试题分析:(1)利用数列前n项和与第n项关系求出
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055258-12340.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055256-19448.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055258-16215.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055257-30524.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055257-30524.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055257-30524.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055257-30524.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055257-43549.png)
试题解析:(1)由
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055258-97978.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055259-75768.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055259-73632.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055259-48675.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055259-41901.png)
所以数列
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055256-19448.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055258-68800.png)
(2)由题意得
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055300-47963.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055300-30084.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055300-84970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055300-70896.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055301-20442.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055301-25386.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055301-18080.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055258-77204.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055244-25851.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055244-26319.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055244-88763.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055245-81684.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055245-38110.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055245-34774.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055245-19079.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055245-45208.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055244-25851.png)
(2)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055246-17024.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055246-32229.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055246-45955.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055236-36148.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055236-55861.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055236-30092.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055237-44997.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055230-47322.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055230-63260.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055230-66172.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055230-21405.png)
A.2 | B.2![]() | C.4 | D.4![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055223-56731.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055224-22456.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055224-15953.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055224-71554.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055224-56955.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055225-58459.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055215-31793.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055215-95319.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055215-78165.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055215-74831.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055215-31793.png)
(2)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191014/20191014055215-80205.png)
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