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有理数运算是中学数学的重要基础之一,它是学生在小学学过的不带符号的整、小、分数运算的继续和发展。因而,不去揭示有理数与学生已学过的不带符号的数之间的关系,性质符号与运算符号之间的关系,而重新去建立一整套运算法则,往往会使学生在学过有理数之后,反而把以前学过的简单问题复杂化了。本文就有理数的意义和运算中的若干问题,提出个人的一些看法,以期共同探讨、研究。
Rational number arithmetic is one of the important bases of high school mathematics. It is the continuation and development of unsigned integral, small and fractional arithmetic that students have learned in elementary school. Therefore, instead of revealing the relationship between the rational number and the unsigned number that the student has learned, the relationship between the nature symbol and the symbol of the operation, and re-establishing a complete set of algorithms often leads the students to learn the rational number, Instead, it complicates the simple problems learned before. In this paper, the significance of rational numbers and computing a number of issues, put forward some personal views with a view to discuss and study.