一、教学目的整式的教学是中学代数教学中的重要組成部分之一。正如大家所知道的,它在中学代数所包含的四項主要內容:数的概念、代数式的恆等变模、函数与方程的构成中起着很重要的作用。首先,它是基于有理数而抽象化的产物。整式学习好了,对澄清有理数部分的疑难和巩固有理数部分的基础知識,会起非常重要的作用。例如对于整式的特定值的确定,經常需要进行大量的有理数运算,这样就能进一步巩固有理数的运算;又如在有理数学习时,学生感到此較困难的問題是|a|究竟等于a还是-a;a与-a的正、負以及二者的大小,若从代数式反回去 First, the purpose of teaching the whole teaching is an important part of algebra teaching in middle school. As everyone knows, it plays an important role in the four main contents of algebra in middle school: the concept of numbers, algebraic constant modulus, and the formation of functions and equations. First, it is a product of abstraction based on rational numbers. The whole type of learning is good, it will play a very important role in clarifying the difficulties of the rational part and consolidating the basic knowledge of the rational part. For example, for the determination of a specific value of a whole formula, a large number of rational number operations are often needed, which can further consolidate the operation of rational numbers; also, for example, when learning with rational numbers, students find this more difficult problem whether |a| is equal to a or -a. ;a and -a are positive and negative, and the size of both, if returned from algebraic expression