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教材简析:在数学基础理论中,加法交换律和加法结合律通常是以集合论为依据加以证明的。此外,也可以用计数公理来说明:任意两个数a与b相加,不论是a+b,还是b+a,结果都一样;类似地,任意三个数相加,不论先把前两个数相加,还是先把后两个数相加,计算顺序不同,并不影响计算的结果。本节课的知识点看似简单,但是学生真正掌握起来有一定的难度,特别是应用加法运算定律改
Teaching material analysis: In the basic theory of mathematics, addition and exchange law and addition law is usually based on set theory to prove. In addition, you can also use the counting axioms to illustrate: any two numbers a and b add, either a + b, or b + a, the result is the same; Similarly, any three numbers together, regardless of the first two Add the number, or add the first two numbers, the calculation sequence is different, does not affect the calculation results. The lesson’s point of knowledge may seem simple, but the students really have a certain degree of difficulty, especially the application of the law of addition to change