因式分解的教学,在初二代数课本中介绍三种基本方法,便利学生理解.但在学习过程中,要充分认识到这节内容在整个中学代数课程中占有相当重要的地位.如:分式的约分、通分;异分母分式的加减法;多项式的和、差、积、根式的化简计算;方程和方程组的求解;将三角函数式进行恒等变形等 Decomposition-based teaching introduces three basic methods in the second and second-generation algebra textbooks to facilitate students’ understanding. However, in the learning process, it is necessary to fully realize that this section occupies a very important position in the entire middle school algebra curriculum. Approximation and pass-through of equations; addition and subtraction of different denominator fractions; simplified calculations of sums, differences, products, and radicals of polynomials; solutions of equations and equations; isomorphic transformation of trigonometric functions, etc.