题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121645-34921.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121646-92938.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121646-46870.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121646-10511.png)
①求
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121646-74968.png)
②求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121646-68479.png)
③令
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121646-17861.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121646-99520.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121647-37040.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121647-37916.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121647-37916.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121647-67576.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121647-77013.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121647-30919.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121647-38004.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121648-26190.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121647-37040.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121648-81088.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121647-37916.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121647-67576.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121647-37040.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121648-86236.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121647-37916.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121647-67576.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121647-37040.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121648-51216.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121647-37916.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121647-67576.png)
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121646-46870.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121646-10511.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121646-74968.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121648-96468.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121649-94006.png)
令
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121649-16981.png)
然后又叠加求
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121649-53330.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121646-68479.png)
(3)在第(2)的基础上,
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121649-72554.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121650-58957.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121647-37916.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121647-67576.png)
①∵数列{
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121645-34921.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121646-92938.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121646-46870.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121650-89769.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121650-44182.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121650-64884.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121647-77013.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121647-30919.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121651-35159.png)
②∵
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121646-46870.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121648-96468.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121649-94006.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121651-66847.png)
令
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121649-16981.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121648-81088.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121651-41637.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121651-77593.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121647-38004.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121652-91769.png)
③
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121652-34575.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121652-24464.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121652-92280.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121653-99544.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121653-82943.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121653-10141.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121653-99064.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121648-26190.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121647-37040.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121648-81088.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121647-37916.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121647-67576.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121647-37040.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121648-86236.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121647-37916.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121647-67576.png)
当
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121647-37040.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121648-51216.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121647-37916.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121647-67576.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121632-41444.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121632-66334.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121632-95148.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121633-85051.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121633-32767.png)
A.4 | B.![]() | C.![]() | D.![]() |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121625-52082.png)
(I)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121626-20997.png)
(II)记
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121626-21892.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121615-74157.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121615-60866.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121615-55912.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121616-36862.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121616-11277.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121616-16840.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121617-58847.png)
(I)求
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121616-36862.png)
(II)求
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121615-74157.png)
(III)由数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121615-74157.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121617-80279.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121617-18056.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121607-58564.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121608-82313.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121607-58564.png)
(2)若
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121608-30827.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121608-37426.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121608-37426.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121609-69219.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121609-40516.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012121608-37426.png)
A.3 | B.6 | C.9 | D.36 |
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