论文部分内容阅读
教学“倒数”这一概念时,为使学生深刻理解并熟练掌握“倒数”概念,首先让学生计算下例各题:3×1/3 3/8×8/3 2/5×5/2 3/4×4/3 1/12×12 5×1/5在计算的基础上,让学生回答几个算式的乘积是几,引导学生观察几个算式中的两个因数有什么特点,从而总结出“乘积是1的两个数互为倒数。”然后启发学生思考什么叫互为倒数,结合计算题的实例说明谁和谁互为倒数,谁是谁的倒数。这样学生对倒数的意义就有比较深刻的理解。为让学生熟练地掌握求倒数的方法,可引导学生解答下列问题:①1的倒数是几?②0有没有
When teaching the concept of “reciprocal”, to enable students to understand and master the “countdown” concept first, students should first calculate the following questions: 3 × 1/3 3/8 × 8/3 2/5 × 5/2 3/4 × 4/3 1/12 × 12 5 × 1/5 On the basis of the calculation, let the students answer the question of what is the product of several formulas and guide students to observe what are the characteristics of the two factors in several formulas Summed up the “product is a reciprocal of the two numbers of each reciprocal.” And then inspired students to think of what is reciprocal each other, with examples of calculation problems who and who reciprocate each other, who is who countdown. Such students have a deeper understanding of the meaning of the countdown. For students to master the method of calculating the reciprocal number, can guide students to answer the following questions: ① 1 countdown is? ② 0 there is no