题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104501-38079.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104501-54380.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104502-58486.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104502-53398.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104502-57913.gif)
(Ⅱ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104502-53317.gif)
(Ⅲ)记
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104503-54807.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104503-88915.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104503-84259.gif)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104503-82253.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104504-24437.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104504-54133.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104504-15573.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104504-86148.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104505-16910.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104505-73166.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104505-52002.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104505-45087.gif)
(II)(5分)解:由题设可得
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104506-53002.gif)
所以
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104506-80347.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104506-21949.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104506-62718.gif)
由
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104507-94683.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104507-29746.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104507-68585.gif)
所以数列
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104502-53317.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104507-96476.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104507-89799.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104508-99611.gif)
(III)(4分)证明:由(II)可知 当
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104503-88915.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104508-26540.gif)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104503-88915.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104508-64404.gif)
易知
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104508-23141.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104509-54619.gif)
又当
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104503-88915.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104509-18785.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104503-54807.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104509-71627.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104509-98018.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104510-66698.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104510-24944.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104510-52826.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104511-55614.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104511-99204.gif)
综上,当
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104503-88915.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104511-35079.gif)
解析
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104448-90879.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104448-99969.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104449-24649.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104432-43923.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104433-15998.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104433-38622.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104433-88278.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104433-85179.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104434-95736.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104434-20522.png)
(1) 求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104432-43923.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104433-88278.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104434-36191.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104434-28484.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104433-85179.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104415-74171.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104415-81499.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104415-86248.gif)
A.-6![]() | B.-3 | C.-1 | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104410-12012.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104410-82481.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104405-98184.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104406-88533.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104406-39358.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104406-67127.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104406-40047.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104407-88151.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191011/20191011104406-67127.gif)
A.16 | B.15 | C.14 | D.12 |
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