因式分解是初中数学的重要内容之一，其解法变化多样，历来是同学们学习的一个难点．提取公因式则是因式分解的最基本的方法，对一个多项式进行因式分解时，首先应考虑提取公因式，看是否有公因式可提取，然后再考虑其他几种方法（公式法、十字相乘法、分组分解法等）．因此， The factorization is one of the important contents of junior high school mathematics. Its solution varies and has always been a difficult point for students to learn. The extraction of the common factor is the most basic method of factorization. When factorizing a polynomial, the first step is to consider the extraction of the common factor to see if there is a common factor to extract, and then consider other methods (formula Law, cross multiplication, group decomposition, etc.). therefore,