从2加4加6加8一直加到100,等于多少?
人气：349 ℃ 时间：2020-06-20 10:23:08
解答
有公式的
首项为2,末项为100,一共50项
所以总和S=（首项+末项)x项数/2
=(2+100)x50/2
=2550
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