数学是一门具有严密的逻辑系统的学科,在数学教学中,作为抽象理论所反映的实际事例,有时表现得不够明显,不易使学生对抽象理论得到全面的认识,此时应本着具体与抽象相结合这一数学教学的基本原则来进行。如在几何课中,两直线垂直概念的教学,如果只结合着水平线与铅垂线的实际事例,使学生观察, Mathematics is a discipline with strict logic system. In mathematics teaching, the actual examples reflected in abstract theory are sometimes not obvious enough to make students get a comprehensive understanding of abstract theory. In this case, Abstraction combines the basic principles of mathematics teaching. As in the geometry class, the teaching of two vertical lines of concept, if only the combination of the actual examples of horizontal and vertical lines to enable students to observe,