题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063658-18043.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063658-14495.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063658-60434.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063658-36129.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063659-52315.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063659-86229.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063659-15420.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063659-35773.png)
(I)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063700-55929.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063700-61429.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063700-62265.png)
(II) 设
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063710-40087.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063711-75677.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063711-69514.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063711-11051.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063658-14495.png)
答案
(1)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063711-52127.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063712-90427.png)
(II)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063712-42801.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063712-87652.png)
解析
(1)因为
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063712-38975.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063713-37172.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063713-13622.png)
(2)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063713-53170.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063620-93872.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063621-48020.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063621-38850.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063621-61969.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063621-53039.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063622-36419.png)
A.26 | B.13 | C.52 | D.156 |
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063530-45362.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063530-67823.png)
(Ⅰ)求数列{
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063530-45362.png)
(Ⅱ)求数列{|
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063530-22784.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063530-53256.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063507-37482.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063507-44391.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063507-29557.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063507-12319.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063508-19582.png)
(Ⅰ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063507-37482.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063508-90193.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063443-87312.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063443-94935.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063443-97897.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063443-67800.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063443-96240.png)
(Ⅰ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063443-87312.png)
(Ⅱ)等差数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063444-19492.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063443-94935.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063444-73112.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063444-75431.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063444-30521.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063444-61505.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063444-73112.png)
(III)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063444-68323.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063443-94935.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063445-72615.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063426-47719.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063426-77724.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010063427-23279.png)
A.8 | B.-8 | C.±8 | D.![]() |
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