题目
题型:不详难度:来源:
已知数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050401-98229.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050401-90316.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050401-82605.png)
(Ⅰ)求数列{
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050401-17817.png)
(Ⅱ)设
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050402-68965.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050402-61563.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050401-90316.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050402-68874.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050402-60168.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050403-92297.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050403-36789.png)
(Ⅱ) 设
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050403-12556.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050402-68874.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050403-78970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050403-42119.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050404-86519.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050404-89212.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050404-49733.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050404-31703.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050404-89212.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050405-29553.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050405-29431.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050405-87643.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050405-37212.png)
综上
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050404-89212.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050405-29553.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050405-37212.png)
解析
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050356-72581.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050356-42500.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050356-72581.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050357-36975.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050357-23925.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050357-93070.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050333-18573.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050333-82968.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050333-34291.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050333-47381.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050333-85712.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050333-25758.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050333-84539.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050334-40054.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050334-43827.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050333-85712.png)
(1)比较
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050334-60237.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050334-24047.png)
(2)设函数
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050334-38358.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050334-10739.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050334-96609.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050334-27367.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050335-58099.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050333-85712.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050334-96609.png)
(3)设数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050335-63471.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050335-73326.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050335-25418.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050335-74802.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050335-63003.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050335-61114.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050333-85712.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050335-92990.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050335-63471.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050335-68670.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050335-74196.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050335-63471.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050333-84539.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050336-36842.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050336-98173.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050318-36909.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050319-52219.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050319-63640.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050319-26127.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050319-40696.png)
(Ⅰ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050318-36909.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050319-45694.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050320-63749.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050319-52219.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050320-50855.png)
数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050256-66811.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050256-45330.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050257-24372.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050257-11361.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050257-98121.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050257-82678.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050257-18604.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050258-77684.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050258-68437.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050258-43995.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050258-37313.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050259-68970.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050259-33014.png)
(Ⅰ)若
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050259-85541.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050259-90553.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050259-35659.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050300-38360.png)
(Ⅱ)在数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050256-45330.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050300-95982.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050300-48823.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050300-10819.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050301-75765.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050301-51526.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050301-46707.png)
(Ⅲ)在(Ⅰ)的条件下,设数列
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050301-25484.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050302-82664.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050302-47567.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050302-98482.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050302-36056.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050303-54217.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050303-96815.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050303-42431.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050249-31758.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050250-47200.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050250-46239.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050250-97092.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050250-39441.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050251-74187.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191015/20191015050250-46239.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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