【教学内容】北师大版义务教育课程标准小学数学第八册第61页。【教学目标】1.根据学生已有的知识、生活经验,让学生感受用字母表示数的优越性(表达简洁、便于交流、具有普遍性等)。2.探索具体问题中的数量关系和变化规律,并能用字母或含有字母的式子进行描述,使学生进一步体会用字母表示数的特点,建立初步的数感和符号感,培养学生的代数化意识,发展抽象思维。3.经历一些具体问题的探究过程,培养学生学习数学的好奇 【Content】 Beijing Normal University compulsory education curriculum standard eighth grade primary school mathematics 第 61 页. 【Teaching Objectives】 1. According to the students’ existing knowledge and life experience, let the students feel the superiority of using letters to express numbers (simple expression, easy communication, universality, etc.). 2. To explore the relationship between the number of specific issues and changes in the law and can use letters or letters containing the formula described to enable students to further understand the characteristics of the number of letters to establish a sense of number sense and symbol of the initial to develop students’ algebra Consciousness, development of abstract thinking. 3. Experiencing some specific problems of the inquiry process, to develop students curious about learning mathematics