平方差公式是初中代数的重要公式,应用十分广泛,关于它的基本应用已有论述,这里不再重复,本文专门介绍它的巧用,现举例说明.例1乘积(1-1/2~2)(1-1/3~2)…(1/120142)(1-1/20152)的值等于.分析若直接运算很繁,如果用乘法公式,则十分简单. The square deviation formula is an important formula of junior high school algebra, its application is very extensive, and its basic application has been discussed, which will not be repeated here. This article is devoted to its clever use, and is given as an example. Example 1 Product (1-1 / 2 ~ 2) (1-1 / 3 ~ 2) ... (1/120142) The value of (1-1 / 20152) is equal to 1. Analysis If the direct calculation is very complicated, it is very simple if multiplication formula is used.