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300*1+300*2+300*3+···················300*30=?

来源：学生作业帮 编辑：拍题作业网作业帮 分类：数学作业 时间：2024/04/30 05:49:35
300*1+300*2+300*3+···················300*30=?
这种题目怎么换算的急,
300*（1+30）*30/2=139500
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