乘法公式是初中数学中一项十分重要的内容,运用乘法公式时,要理清题目特点,从乘法公式的“整体”结构出发运用乘法公式.如平方差公式的结构特点:(口+△)·(□-△)=□2-△2;完全平方公式的结构特点:(□±△)2=□2±2□△+△2;公式中的“口”和“△”可以是数字也可以是单项式或多项式.下面我们一起来看几个例 Multiplication formula is a very important content in junior high school mathematics. When using multiplication formula, we must sort out the characteristics of the topic and use the multiplication formula from the “whole structure” of the multiplication formula. For example, the structural characteristics of the square difference formula: (+ △)·(□-△)=□2-△2; Structure characteristics of the complete square formula: (□±△)2=□2±2□△+△2; “mouth” and “ in the formula △” can be a number or a monomial or polynomial. Let’s look at a few examples together.