正文 第七十一章 统一叫乘数和因数（求推荐）(第3页/共3页)
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老二没有犹豫直接给出答案。
九九乘法表，老二下了苦功夫！
“朱猛，3x7等于多少？”
“这个我知道，等于21！”
“阿陶，2x9等于多少？”
“18！”
“看来你们如阿溪和夏安一般，对九九乘法表背的挺熟！”
黎阳很是满意。
自己没有提点这些，他们私下来也挺努力。
至于多努力，他不知道。
他只在意结果。
“大哥，我背九九乘法表时发现2x3和3x2，它们结果都一样，两者有什么区别没？”
“结果相同，含义不同！除了意义外，其实也没太大区别！”
黎阳寻思这其中还是自己规定好，不然族人到时可能会拎不清。
前世中，其中这些是经过一番改变才下好定义，俗称课改。
所改是关于‘乘’和‘乘以’。
3个人每个人吃了2块芋曼茎，求他们一共吃了多少芋曼茎？
再‘乘’和‘乘以’区分前，只能读作‘2乘以3’或者‘3乘2’，如果有读者列成‘3x2’这样的式子，则被视为全错。
‘2x3’和‘3x2’结果一样，又符合乘法交换律，后面上面为了降低难度，不再用被乘数和乘数的提法，统一叫做乘数或因数。
两个因数它们位置可以交换，再读它们不能用‘乘以’只能用‘乘’，对式子‘2x3’，既可以读作‘2乘3’也可以读作‘3乘2’！
虽然因数位置可以交换，但结合具体情境，乘法意义并没改变。
以上面吃多少芋曼茎结果为力，列式即可列成‘3x2’可以列为‘2x3’，但表示意义却只有一个，那就是三个人加起来吃了多少芋曼茎。
而不是芋曼茎加起来吃了多少呃……人！
“一般让你们算结果，你们只需要算结果即可，其中涉及意义到具体情境自己再自行判断！”
提到这，黎阳顺势提出乘法交换！
“两个因数，它们可以交换位置！结果并不会改变！”
“这个规律，我称它为：乘法交换律！”
九天上，娲皇宫。
伏羲念叨着‘乘法交换律’若有所思。
“因数？意义不同？结果相同？有趣的交换！”
他越发期待黎阳后面教学。
『加入书签，方便阅读』
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