所谓变式就是指变换问题的条件、结论、问题的形式,而问题的本质不变,以便从不同的角度、不同的方面来说明问题的本质。使一题多用,多题重组,从而使得课堂上的每一分钟都能给学生以新鲜感,以唤取他们的求知欲和注意力。正如著名的数学教育家波利亚曾形象的指出过的:“好问题同 The so-called variant refers to the transformation of the conditions of the problem, conclusions, the form of the problem, and the essence of the problem unchanged in order to explain the nature of the problem from different angles and different aspects. So that a problem with multiple, multiple reorganization, so that every minute in the classroom can give students a fresh feeling in order to call for their curiosity and attention. As the famous mathematics educator Polyana once pointed out in his image: "Good question is the same