Lead the students to conclude the above concept and laws.

引导学生概括出乘法的意义和乘法交换律、结合律.

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Grasp Property and the Associative Property of Addition.

掌握加法交换律和加法结合律,培养学生初步的归纳推理能力.

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Switch the two factors and the product the same. This is the Reflexive Property of Multiplication.

教师引导得出:两个数相乘,交换因数的位置,它们的积不变. 叫做乘法交换律.

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Further on, we can specify an algebra that consists of axioms for commutativity, distributivity, associativity, etc.

进一步的, 我们可以定义包含交换律 、 分配律 、 结合律等公理的代数.

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