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Which lesson is the best in the open class of fourth grade mathematics in Beijing Normal University?
In the open class of fourth grade mathematics in Beijing Normal University, the laws of multiplication, association and exchange are the best.

After consultation, teachers can have more interaction with students in the courses of multiplicative associative law and commutative law, and it is easier. Therefore, the combination law and the exchange law of law are the best.

The Mathematical Society of Beijing Normal University is published by Beijing Normal University Press.

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