在给同学们讲授因式分解时,我们曾先后介绍了提取公因式法、十字相乘法、利用二次方程求根的分解法、添置补助项法、利用简乘公式法、配方法、分组分解法、应用余式定理(综合除法)分解法、待定系数法等。在教学实践中,又发现有另一种解法,也较方便。这就是把一个要分解因式的式子的各项系数,用整10乘求得的余数,再进行 In teaching students to factorization, we have introduced the common factor extraction method, the cross multiplication method, the use of quadratic equation root decomposition method, purchase subsidy method, the use of simple formula formula method, with the method, Group decomposition method, the application of the remainder theorem (synthesis division) decomposition method, to be determined coefficient method. In teaching practice, but also found another solution, but also more convenient. This is done by dividing the coefficients of an equation to be factored into divisors by the sum of 10 multiplications