题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063447-38617.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063458-98987.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063458-69962.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063458-90455.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063459-95230.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063459-72290.png)
A.![]() | B.![]() | C.![]() | D.![]() |
答案
解析
试题分析:∵
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063458-90455.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063459-72290.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063500-77837.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063500-75419.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063501-66561.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/20191012/20191012063436-83049.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063437-36355.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063437-71138.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063437-35662.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063437-99602.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063438-95319.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063438-27542.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063438-26716.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063438-98157.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063439-37362.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063437-35662.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063439-93676.png)
(Ⅰ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063439-35818.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063439-93676.png)
(Ⅱ)是否存在正整数
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063439-52361.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063440-96631.png)
已知数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063411-44421.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063411-23369.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063412-98717.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063412-78188.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063412-63766.png)
(1)设
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063412-22646.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063412-71742.png)
(2)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063411-44421.png)
(3)若
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063413-34125.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063413-54305.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063413-24513.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063413-70414.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063414-72197.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063414-77699.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063414-99097.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063414-54725.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063403-46603.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063404-16961.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063404-59915.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063404-14677.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063404-59348.png)
A.![]() | B.![]() | C.![]() | D.3-n |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063356-88774.png)
1 | | 2 | | |
0.5 | | 1 | | |
| | ![]() | | |
| | | ![]() | |
| | | | ![]() |
设数列{
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063330-64694.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063330-93773.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063330-97042.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063331-13755.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063331-72940.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063331-15869.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063331-72940.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063331-91905.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063331-20494.png)
(1)求数列{
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063330-64694.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063331-72940.png)
(2)设
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063331-23934.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063332-13284.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012063332-87696.png)
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