SSAT数学求解:what is the average of the first 50 positive intege

问题描述:

SSAT数学求解:what is the average of the first 50 positive integers?
1个回答 分类:英语 2014-12-16

问题解答:

我来补答
(50+1)/2
再问: 什么公式
再答: (首项+末项)×项数/2=总和 总和/项数=平均数
 
 
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