一个人从外面回来,自家的门儿是不会走错的,而只去过一次的朋友家往往容易串错。这个日常问题的原因,是心理学中说的与重现次数多少有关系的。重现次数多,使分管这部门的神经系统多次建立联系,就留下了印象,概念得到深化,技能得到熟练。数学中某些概念,不是一下子就能理解的。如函数概念,在小学里已有渗透,初中里已有定义,高中也有定义,初中里只介绍一些简单的一次、二次代数函数及锐角三角函数的初步知识。因此教师不可能把函数概念在初中时就讲清楚,讲透彻。象这样的概念只能逐步理解,逐步深化。概念要讲请,但有的概念只能逐步的讲清。数学教学中一些技能技巧的培养也是数次重 When a person comes back from the outside, the door of his/her home will not go wrong, and the family of friends who have only been there once will tend to make mistakes. The reason for this daily problem is what psychology says is related to the number of recurrences. The number of recurrences has made it possible to establish links with the nervous system in charge of this department many times. This has left an impression, the concept has been deepened, and skills have become skilled. Certain concepts in mathematics cannot be understood at once. For example, the function concept has been infiltrated in elementary schools, has been defined in junior high schools, and has also been defined in high schools. Junior high school only introduces preliminary knowledge of simple primary, secondary algebraic functions, and acute-angled trigonometric functions. Therefore, it is impossible for the teacher to make the concept of function clear in the junior high school. Concepts like this can only be gradually understood and gradually deepened. Concepts need to be asked, but some concepts can only be explained step by step. The training of some skills in mathematics teaching is also several times