因式分解是初中代数的重要内容,也是教学中的一个难点。对于二次三项式的因式分解,在代数课本中主要介绍的是十字相乘法和求根公式法。本文就二次三项式的因式分解介绍一种方法——“方阵”法。对于二次三项式的因式分解,可用分组分解法来分解。 Factorization is an important content of junior high school algebra, but also a difficult point in teaching. For factorization of quadratic trinomials, the cross-multiplication method and the root-finding formula method are mainly introduced in algebra textbooks. In this paper, a method called “square matrix” method is introduced for the factorization of quadratic trinomials. For factorization of quadratic trinomials, decomposition can be performed using the group decomposition method.