提取公因式是多项式因式分解的一种最基本的方法. 对一个多项式分解因式时,只要它存在公因式就首先把公因式提出来,然后再考虑其他方法.初学因式分解一定要先观察多项式各项有无公因式. 提取公因式时要注意以下几点: The extraction of common factors is a fundamental method of polynomial factorization. When factorizing a polynomial, as long as it has a common factor, it first raises the common factor, and then considers other methods. Beginner factorization Be sure to first observe the polynomials for each of the commonalities. The following points must be noted when extracting the common factors: