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一、问题的提出《中小学数学》(初中版)2012年第1—2期冀怀忠的《抓试题资源,引导学生探究》(以下简称“抓文”),与《中小学数学》(初中版)2012年第3期魏祥勤的《探究一类正方形与等腰直角三角形构造的旋转问题》(以下简称“探文”),两文都选用了一道题目,进行诸多变式,体现了由静到动,由特殊到一般的探究活动,利用常见的等腰三角形、正方形、相似(全等)三角形的性质,从不同的角度给出多种解法,较好地拓展了学生的思维能力.若从培养学生分类讨论等多种数
First, the issue of “primary and secondary mathematics” (Junior High School Edition) in 2012 January 1-2 Ji Huazhong “grasping the test resources to guide students to explore” (hereinafter referred to as “Crawling”), and “primary and secondary mathematics” ( Junior high school version) in 2012 the third Wei Xiangqin’s “explore a type of square and isosceles right triangle structure of the rotation problem” (hereinafter referred to as “exploration text ”), both have chosen a topic, a number of variants, embodied From the static to the dynamic, from the special to the general exploration activities, the common isosceles triangle, square and similar (congruent) triangles are used to give a variety of solutions from different perspectives, which expand students’ thinking Ability to classify students from a variety of numbers