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教材是最基本的课程资源,教学中必须吃透教材、依循教材,进而活用教材,对教材进行二度开发。“射线”这一知识点,对于学生来说至少包含了三个难点:一是对“无限延长”和“无限长”不容易理解与把握,二是对“怎么才能延长线段”体验不深,三是对“如何运用有限来表示无限长的射线”也未关注过。教学时,通过还原知识的演变、生成过程,拓展主体的探索、体验过程,有效激活了静态的教材内容,使之动态化、活动化,帮助学生切实把握射线的特征及其画法。
Teaching materials is the most basic course resources, teaching must be thoroughly through teaching materials, follow the teaching materials, and then use textbooks, textbooks for the second development. “Ray ” This point of knowledge, for students, contains at least three difficulties: First, “unlimited extension ” and “unlimited length ” is not easy to understand and grasp, the second is Extension of the line “experience is not deep, the third is ” how to use limited to represent the infinite ray "nor attention. Teaching, through the reduction of knowledge evolution, generation process, expand the main exploration, experience the process, the effective activation of the static textbook content, make it dynamic, activities, to help students effectively grasp the characteristics of the ray and its painting.