论文部分内容阅读
初中数学在“图形的变化”中,主要介绍了“图形的轴对称、旋转、平移、相似、投影”五块内容.其中,图形的轴对称、平移和旋转只改变图形的位置,不改变图形的形状和大小,其本质是全等变换.然而近年来,一类图形翻滚类题目频频出现在中考题中,那么“图形的翻滚”究竟属于图形变化的那一类?图形翻滚的本质是什么?解决这类问题又该采取怎样的策略?这
Junior high school mathematics in “graphics changes ” mainly introduces the “axisymmetry, rotation, translation, similarity, projection ” five elements.Among them, the axis of the graphics symmetry, translation and rotation only change the position of the graphics , Without changing the shape and size of graphics, its essence is congruent transformation.However, in recent years, a type of graphic tumbling class frequently appeared in the exam questions, then “graphic tumbling ” belong to the type of graphic changes? What is the nature of graphic tumbling? What kind of strategy should we adopt to solve such problems?