因式分解是乘法公式的逆向运用,与整式乘法运算有密切的联系。学生在解因式分解题时,往往会发生结果不是乘积形式,分解不测底等错误,如何让学生真正会分解、巧分解呢?对于初中阶段,常用的因式分解方法有:提公因式法、公式法、十字相乘分组分解法等。【例1】下列各式由左边到右边的变形中,是因式分解的是 Factorization is the reverse use of multiplication formulas, and integer multiplication operations are closely linked. Students in the factorization of the problem, often results will not be the product of the product, the decomposition of unexpected errors, how to make students really will decomposition, clever decomposition? For junior high school, the commonly used factorization methods are: Method, formula method, cross multiplication group decomposition method. 【Example 1】 The following types of deformation from left to right, the factorization is