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On the algorithm formula in the second volume of the fourth grade mathematical concept
(1) additive commutative law a+b = b+a.

(2) Additive associative law (a+b)+c=a+(b+c)

(3) Multiplicative commutative law ab=ba

(4) Multiplicative associative law (ab)c=a(bc)

(5) The distribution law of multiplication to addition. (a+b)c=ac+bc

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