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因式分解是初中数学中重要的一种恒等变形，它在近年来的各类竞赛中屡见不鲜．求解它们．仅靠课本介绍的提取公因式法、公式法、十字相乘法、分组分解法很难奏效．我们必须掌握和借助一些其他的常用方法．（199年“缙云杯”初中数学邀请赛试题）门993年华罗庚数学学校初一训练
Factorization is an important kind of metamorphosis in junior high school mathematics. It is not uncommon in all kinds of competitions in recent years. Solve them. It is difficult to work with the extracted public factor method, formula method, cross multiplication method and group decomposition method introduced by textbooks alone. We must master and use some other common methods. (1993 “Jinyun Cup” junior high school mathematics invitational exam questions) The 993th Hua Luogeng mathematics school first training