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小学数学第八册行程应用题的教学,主要是在学生已学过的有关路程、速度和时间三者的基本数量关系的基础上,进一步学习行程问题中有关“相向相遇”的问题。相向相遇求路程、相向相遇求时间以及相向相遇求一速度等三种情况。通过教学,要使学生进一步理解路程,速度和时间的相依关系,提高学生解答行程应用题的能力,培养良好的思维品质;同时,也为以后在分数,比例等单元学习解答此类问题打下基础。但由于学生年龄尚小,对实际生活中的相遇问题缺乏了解,且空间观念薄弱,故学习这类问题时,普遍感到困难,或乱套公式,不求甚解;或张冠李戴,数量关系模糊。根据这些情况,我在
On the basis of the basic quantitative relationship among the distance, speed and time that the students have already learned, it is necessary to further study the question of “meeting each other” in the itinerary. Meet the other side of the journey, seeking time and meet the opposite speed of seeking three cases. Through teaching, we should enable students to further understand the interdependence of distance, speed and time, improve the ability of students to answer travel questions and cultivate good thinking qualities, and at the same time, they also lay the foundation for future study of such problems in units of fraction and proportion. . However, due to the fact that students are still young and do not have enough understanding of the encounters in real life, and the concept of space is weak, it is generally difficult or indiscriminate when studying such problems. According to these situations, I am here