因式分解,就是将一个多项式分解为几个整式的乘积的形式.例如把a2-b2化为(a+b)(a-b)就是因式分解.学因式分解,首先要掌握提取公因式法、公式法、分组分解法、十字相乘法、求根公式法及待定系数法等因式分解的基本方法,此外,还要注意以下几点: Factorization is the decomposition of a polynomial into the product of several integers. For example, converting a2-b2 to (a+b)(ab) is a factorization. For factorization, we must first master the extracted common factor. The basic methods of factorization, such as method, formula method, group decomposition method, cross multiplication method, root-finding formula method and undetermined coefficient method, also need to pay attention to the following points: