因式分解是代数中重要的恒等变形,在分式的约分通分、根式运算、解方程。三角函数恒等变形中有着广泛的应用,要求学生必须熟练掌握,但许多学生在这个知识的掌握上出现困难和误区,现分类举例归纳常见错型如下,以期帮助同学们注意预防和自觉纠正错误。 Factorization is an important isomorphic deformation in algebra, about fractional division, rooting, and solving equations. The trigonometric function has a wide range of applications in the constant deformation. It requires students to master it well. However, many students have difficulties and misunderstandings in the mastery of this knowledge. The classification examples include common mistakes as follows in order to help students take precautions and consciously correct mistakes. .