1.问题的提出纵观中学数学课堂教学,常常会遇到如下所谓的探索式、开放式的教学现象:过分重复老题陈题,问题设计不具有开放性和思考性,问题陈旧,缺乏新意,无新颖性,无创造力.学生没有足够的思考空间,讨论无实质性内容,沦为形式.特别是教师引导过多,使学生在思考中处处有"扶 1. Problems raised Throughout the middle school mathematics classroom teaching, often encounter the following so-called exploratory, open-ended teaching phenomenon: too much repetition of old questions, problem design is not open and thinking, the problem is obsolete, the lack of new ideas , No novelty, no creativity.Students do not have enough space for thinking, discussion of non-substantive content, reduced to form.Especially teachers too much, so that students everywhere in thinking