题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124716-59313.png)
A.6 | B.7 | C.8 | D.9 |
答案
解析
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124716-27610.png)
若x=n,剩下数的平均数为
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124716-55696.png)
若x=1,则剩下的数的平均数为
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124717-56120.png)
故
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124717-63987.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124706-36936.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124706-77321.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124706-16535.png)
(Ⅰ)设
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124707-96807.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124707-85083.png)
(Ⅱ)求数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124706-36936.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124707-49288.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124707-60712.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124646-21262.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124646-60997.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124646-72516.png)
A.1 | B.2 |
C.4 | D.8 |
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124626-15497.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124626-82453.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124626-95417.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124627-52257.png)
(Ⅰ)证明:数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124627-94889.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124627-31766.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124628-61463.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124628-75005.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124557-91460.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124557-69694.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124557-69694.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124558-62727.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124558-32234.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124558-12528.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124558-21949.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124557-69694.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124558-98528.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124558-26003.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124557-69694.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124558-37078.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124559-38192.png)
(Ⅰ)试问
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124559-57437.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124559-76163.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124557-69694.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124557-69694.png)
(Ⅱ)求
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124559-18235.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124557-69694.png)
(Ⅲ)证明:
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124559-53137.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124557-69694.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124540-33540.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124540-12870.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124540-34417.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124541-73411.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124541-88312.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124541-62114.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124542-57021.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124542-11503.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124542-59860.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124542-22700.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124542-57021.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124543-18614.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124541-88312.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124541-62114.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124543-30164.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124541-62114.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124543-30164.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124543-91515.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124543-37454.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124544-84900.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124544-91448.png)
给出下列三个结论:
① 数列
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124544-23656.png)
② 对
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124544-46890.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124545-22869.png)
③ 若
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124545-45879.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124545-76725.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124545-75593.png)
其中,所有正确结论的序号是_____.
![](http://img.shitiku.com.cn/uploads/allimg/20191012/20191012124546-16648.jpg)
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