一些初一学生学了有理数加减后,常产生这样的疑惑:正、负数的引入,既然是人们在数的认识上的一次飞跃,那么有理数的加、减法与小学数学中的加减法相比,有什么“优越”之处?它解决了哪些小学数学不能解决的问题?它与小学数学的加减运算有什么联系?有什么区别?这些问题,实质上提 Some students learn the rational number addition and subtraction, often have such doubts: The introduction of positive and negative numbers, since it is a leap in the number of people’s understanding, then the rational number of addition and subtraction with primary school mathematics addition and subtraction , What is the “superiority”? It solves the problems that can not be solved by elementary mathematics, and is it related to the addition and subtraction of primary mathematics? What are the differences? These questions are essentially