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恒等变形在数学解题中几乎处处碰到．利用因式分解是进行恒等变形的一种很重要的数学方法。它的应用极为广泛，这里就同学们已学过的知识内容谈几点应用．一、数值计算例１若ａ＝－２，ｂ＝０．２，求代数式［（ａ２＋２ａｂ－８ｂ２）÷（ａ－２ｂ）－（６ａ２＋ａｂ－ｂ２）
Identical deformations are encountered almost everywhere in mathematical problem solving. The use of factorization is a very important mathematical method for performing constant deformation. Its application is extremely extensive. Here we talk about the applications of the knowledge that the students have learned. 1. Numerical Calculation Example 1 If a=-2, b=0.2, find the algebraic expression [(a2+2ab-8b2)÷(a-2b)-(6a2+ab-b2)