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负数加减法介绍

更新时间: 2021-03-24 10:24:05     

1、有理数加法法则:同号两数相加,取相同的符号,并把绝对值相加。

2、异号两数相加,绝对值相等时和为0;绝对值不等时,取绝对值较大的数符号,并用较大的绝对值减去较小的绝对值。一个数同0相加,仍得这个数。

3、有理数减法法则:减去一个数,等于加上这个数的相反数。通常简单的记法:两数相加,同号为正,异号为负。(要看数值的大小)

关键词: 负数 加减法 介绍

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