初学因式分解，往往对因式分解的意义理解不透彻，方法掌握不熟练，公式应用不灵活，因而出现形形色色的错误．本文就几种因式分解中的常见错误及原因加以分析，以错悟理，正本清源．一、概念理解错误分析　因式分解的结果是几个整式的积的形式，而ｘ（ｘ＋２）－３不是乘积形 The factorization of beginners tends to be incomprehensible to the meaning of factorization, unskilled in method mastery, and inflexible formula application, resulting in a variety of errors. This article analyzes the common mistakes and causes in several factorizations, and uses the principles of error and reason. First, the concept of understanding of the error analysis Factoring the result is the product of several integer formula, and x (x + 2) -3 is not a product