论文部分内容阅读
小学数学课本谈到四则运算的关系时,指出“减法是加法的逆运算”、“除法是乘法的逆运算”;但课本没有说“加法是减法的逆运算”,也没有说“乘法是除法的逆运算”。现在要问:究竟什么叫做逆运算?为什么减法是加法的道运算、除法是乘法的道运算?课本为什么不说“加法是减法的逆运算”,也不说“乘法是除法的逆运算”?本文试就这些问题谈点肤浅的认识和体会,以供参考。数的运算,通常总是在给定的数集上定义的。设A是一个给定的数集,而(?)是一个给定的法则,如果根据法则(?),对于从集A中按先后顺序取出来的任何两个数a与b,都能得到集A中的一个数C,即有
When talking about the relationship between the four operations, the primary school mathematics textbook states that “subtraction is the inverse of addition” and “division is the inverse of multiplication.” However, the text does not say “addition is the inverse of subtraction” nor does it say “ The inverse of the operation. ” Now ask: What is the inverse operation? Why subtraction is the addition of the Road operation, division is multiplication Road operation? Why not textbook “Addition is the inverse of subtraction”, do not say “multiplication is the division of the inverse operation”? This article tries to talk about these issues superficial understanding and experience for reference. The number of operations, usually defined on a given number set. Let A be a given set of numbers, and (?) Be a given law, and if, according to the law (?), Any two numbers a and b taken out in order A from set A A set of A number C, that is