题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015449-16345.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015449-80301.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015449-20149.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015450-87849.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015450-18550.png)
(Ⅰ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015449-16345.png)
(Ⅱ)设
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015450-77531.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015450-77287.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015450-99072.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015451-83456.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015451-70034.png)
解析
试题分析:(Ⅰ)根据等差数列的性质,
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015451-50300.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015451-95307.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015452-11626.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015452-82865.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015452-37301.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015452-11342.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015452-59239.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015453-90152.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015453-68631.png)
试题解析:(Ⅰ)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015453-77702.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015453-17637.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015453-32344.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015454-72283.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015454-57634.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015454-34452.png)
(Ⅱ)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015454-69180.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015455-60206.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015455-22932.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015455-70554.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015455-21776.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015455-94620.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015456-76900.png)
核心考点
举一反三
S1=1
S2=2+3=5
S3=4+5+6=15
S4=7+8+9+10=34
S5=11+12+13+14+15=65
S6=16+17+18+19+20+21=111
S7=22+23+24+25+26+27+28=175
… … … … … … … …
可得
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015434-67193.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015407-63964.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015407-11487.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015407-33878.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015408-42560.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015408-52542.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015408-67376.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015408-89763.png)
(1)求实数
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015408-47063.png)
(2)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015407-63964.png)
(3)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015409-28851.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015359-99684.png)
A.2 | B.—2 | C.—3 | D.3 |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015323-28425.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015324-74340.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015324-53806.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015324-76939.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015324-28701.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015324-74340.png)
(Ⅰ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015323-28425.png)
(Ⅱ)设
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015324-30381.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015325-94604.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015324-74340.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015325-89437.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015324-74340.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015250-93473.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015250-84270.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015251-90412.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015251-48943.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015251-31474.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015251-45174.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015251-10671.png)
(1)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015250-93473.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015251-90412.png)
(2)令
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015252-25276.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015252-86703.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015250-84270.png)
(3)设
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015252-63280.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015252-75908.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015250-84270.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015253-77571.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015253-93263.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015253-54110.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012015253-85655.png)
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