“欲速则不达”是一句充满辨证哲理的名言 ,是辨证唯物主义关于事物发展是量变和质变的辨证统一的通俗说法 .它表明只有量变积累到一定程度 ,才有发生质变的可能 ;没有量的积累 ,不顾条件 ,急于求成 ,反而会阻碍了最终目标的实现 .在数学教学中 ,教师往往对学生有较高的期望 , “Speed ​​is not reached” is a saying full of dialectical philosophy. It is a popular saying that dialectical materialism is about the dialectical unity of the development of things. It shows that only when quantity changes accumulate to a certain extent can there be a possibility of qualitative change. Accumulation of quantity, regardless of conditions, eager to achieve, but will hinder the realization of the ultimate goal. In mathematics teaching, teachers often have higher expectations of students,