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因式分解是一种代数恒等变形,它是解决许多数学问题的有力工具．下面举例介绍几种常用的因式分解方法．一、十字相乘法
Factorization is an algebraic constant deformation, it is a powerful tool to solve many mathematical problems. Here are some examples of commonly used factorization methods. First, cross multiplication