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在二年级上册教材中,学生已经接触了一些排列与组合知识,在三年级上册教材中继续学习排列与组合的内容。本册教材就是在学生已有知识和经验的基础上,继续让学生通过观察、猜测、实验等活动找出事物的排列数和组合数。与二年级上册教材相比,本册教材的内容更加系统、全面,分别介绍了排列以及组合,重在向学生渗透这些数学思想,并初步培养学生有顺序地、全面地思考问题的意识。但是在实际的学习中,对于排列与组合的题目学
In the second grade textbook, students have been exposed to a number of permutations and combinations of knowledge, in the third grade textbook continue to learn the arrangement and combination of content. The textbook is based on the students’ existing knowledge and experience, and continue to let students find out the arrangement and number of things through observation, speculation, experiment and other activities. Compared with the second grade textbook, the content of this textbook is more systematic and comprehensive, respectively introduced the arrangement and combination, focusing on infiltrating these mathematical ideas to students, and initially cultivate students awareness of problems in a sequential and comprehensive manner. However, in practical learning, the subject of arrangement and combination of topics