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一、教材分析1.教材地位及作用.“字母能表示数”是北师大版七年级上册第三章第一节内容,又是学习代数式的基础.本节充分体现由特殊到一般,由一般到特殊的思维过程,让学生经历探索数量关系和变化规律的认识过程,认识到字母代数的方便之处,感受到字母代数的优越性.本节结合学生的生活经历和已有的知识经验,在学生熟悉的情境中呈现知识,让学生通过观察、试验、类比、推断等活动,体验数、符号和图形,能有效地描述现代世界的数量关系,既能提高其学习兴趣,又能培养学生运用数学的意识和能力.
First, the textbook analysis 1 textbook status and role. “Letter can represent the number ” is the seventh edition of the Beijing Normal University version of the third chapter of the first section, but also to learn the basis of algebraic style.This section fully embodies the special to general , From the general to the special thinking process, allowing students to experience the process of exploring the relationship between quantity and variation of the law, recognize the convenience of algebra and feel the superiority of algebra.This section combines the student’s life experience and the existing Knowledge and experience, presenting knowledge in the familiar situations of students, allowing students to experience the number, symbols and graphics through observation, experiment, analogy, inference and other activities, effectively describing the quantitative relationship in the modern world and enhancing their interest in learning Can train students to use mathematics awareness and ability.