论文部分内容阅读
学习目标1.理解有理数的减法法则,体会分类和转化的数学思想.2.能利用有理数减法法则进行简单的加减运算.活动方案活动一:复习回顾有理数的加法运算计算:(请写出运算过程)(1)18+(+8);(2)-25+(+15);(3)23+(-17):(4)-28+(-10).活动二:合作探究有理数减法法则(一)问题在小学,只有当被减数大于或等于减数时,我们才会计算这样的算式(例如5-3,3-3).现
Learning Objectives 1. Understand the law of subtraction of rational numbers, understand the mathematical thinking of classification and conversion .2. Can use the rule of rational numbers subtraction simple addition and subtraction. Activity Program Activity 1: review review rational number addition calculation: (Please write out the operation (2) -25 + (+ 15); (3) 23 + (- 17) :( 4) -28 + (- 10) Activity 2: Cooperatively explore rational numbers Subtraction Rule (1) Problem In elementary school, we only calculate such formulas when the number of subtractions is greater than or equal to the number of subtractions (eg, 5-3, 3-3).