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从一加到一百九十九等于多少
更新时间: 2020-10-03 00:00:00  

从一加到一百九十九,显然这些数字组成一个等差数列,求这些数的和即为求等差数列的和;

等差数列前n项和求法:首项加末项的和,乘项数,除以2;

从一到一百九十九一共有二百项,首项是1,末项是199,代入公式计算结果得19900。

关键词: 一百 等于 多少

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