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分组分解法是因式分解中的重要方法之一,分组的目的是为提取公因式,应用乘法公式创造条件,以便顺利地达到分解因式的目的·如何正确分组是关键,不少学生感到困难,下面介绍几种常见的思路,供同学们学习时参考·一、按公因式分组例1(2004年青海省)分解因式a2-ab+ac-bc·分析:第1
The group decomposition method is one of the important methods in factorization. The purpose of the grouping is to extract the common factors and apply the multiplication formula to create the conditions so that the purpose of the factorization can be successfully achieved. How to correctly group is the key. Many students feel that Difficulties. Here are some common ideas for students to learn when referencing: 1. Grouping by common factors Example 1 (Qinghai Province, 2004) Decomposition factor a2-ab+ac-bc. Analysis: No. 1