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1·有理数加减运算的顺口记忆:同号相加一边倒,异号相加“大”减“小”;符号跟着大的跑,绝对值相等“零”正好.[注]“大”减“小”是指绝对值的大小.
1 · The logical addition and subtraction of rational numbers Shun Tong memory: the same number add one-sided down, the addition of “” big “minus ” small “symbol followed by a large run, the absolute value of the same ] ”Big “ minus ”Small " means the absolute value of the size.