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运用公式法分解因式是及其重要基本方法之一,公式法涉及两个重要的基本公式:(1)平方差公式:a~2一b~2=(a+b)(a-b);(2)完全平方公式:a~2±2ab+b~2=(a±b)~2.运用这两个公式分解因式常用的技巧如下.
The use of the formula method factorization is one of its most important basic methods, the formula method involves two important basic formulas: (1) square deviation formula: a ~ 2 a b ~ 2 = (a + b) (ab); ( 2) The complete square formula: a ~ 2 ± 2ab + b ~ 2 = (a ± b) ~ 2. The commonly used techniques to factorize the two formulas are as follows.