题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010527-53137.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010527-10436.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010528-56644.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010528-28814.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010528-26566.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010528-25770.png)
A.![]() | B.![]() | C.![]() | D.![]() |
答案
解析
试题分析:∵
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010528-28814.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010528-25770.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010529-11564.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010530-22784.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010530-88755.png)
点评:掌握平均数及中位数的的概念是解决此类问题的关键,另外本题还需要掌握等差数列的前n项和通项公式
核心考点
举一反三
已知数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010514-16335.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010514-93867.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010514-67798.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010515-62993.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010515-50559.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010515-50700.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010515-14529.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010515-28310.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010516-23094.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010516-76489.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010515-62993.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010516-78040.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010516-51282.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010516-78040.png)
(Ⅱ)是否存在正整数
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010517-29491.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010517-96078.png)
已知数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010451-47234.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010451-96520.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010451-38137.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010452-11522.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010452-36664.png)
(1)设
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010452-85183.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010453-84567.png)
(2)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010451-47234.png)
(3)若
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010453-18212.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010453-12896.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010453-96678.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010454-20437.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010454-39633.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010454-85336.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010454-29901.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010454-28164.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010335-88841.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010336-60019.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010336-48459.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010336-13574.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010337-86476.png)
A.![]() | B.![]() | C.![]() | D.3-n |
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010318-17931.png)
1 | | 2 | | |
0.5 | | 1 | | |
| | ![]() | | |
| | | ![]() | |
| | | | ![]() |
设数列{
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010306-27023.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010306-24438.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010306-67024.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010307-73441.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010307-59755.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010307-90493.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010307-59755.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010307-49625.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010308-63580.png)
(1)求数列{
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010306-27023.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010307-59755.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010308-97882.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010308-49651.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191010/20191010010308-99254.png)
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