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乘法公式,初中同学人人皆知,但是未必都会灵活运用.本文告诉你怎样巧妙地应用乘法公式,且看五招:1.直接用例1计算:(3x+2y)(3x-2y).分析将3x和2y分别看作平方差公式中的a,b,直接套用平方差公式.
The multiplication formula is well-known to all junior high school students, but it may not always be used flexibly. This article tells you how to skillfully apply the multiplication formula and look at five strokes: 1. Calculate directly using Case 1: (3x+2y) (3x-2y). Treat 3x and 2y as a and b in the square difference formula, and apply the squared difference formula directly.