论文部分内容阅读
教学内容新世纪《义务教育教科书·数学》四年级上册第四单元“运算律”中“乘法分配律”第一课时(第56页)。背景说明乘法分配律是“运算律”单元中的一个重要内容。其一,运算律的表达形式是一个恒等式,是对原来的算式进行恒等变形,学习这部分内容,有助于对运算意义的理解和对运算本质的把握,也有助于提升学生灵活简洁的运算能力;其二,相对于加法和乘法的交换律和结合律而言,乘法分配律变化比较多,不仅有两种运算,且运
Teaching content The new century “compulsory education textbook · Mathematics” fourth grade on the fourth unit “arithmetic law ” “multiplication assignment law ” the first lesson (p. 56). Background Description The multiplicative assignment law is an important part of the “arithmetic law” unit. First, the expression of arithmetic law is an identity, which is a constant deformation of the original formula to learn this part of content, which helps to understand the meaning of computing and grasp the nature of computing, and also helps to enhance students’ flexibility and conciseness Computing ability; Second, relative to the addition and multiplication of the exchange law and the law of combination, multiplicative distribution law changes more, not only two kinds of computing, and Yun