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Mathematical formulas and concepts in the third grade of primary school! Urgent need!
Additive commutative law a+b=b+a

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

Multiplicative commutative law ab=ba

Multiplicative associative law abc=a(bc)

Multiplication and distribution law (a+b)c=ac+bc

Rectangular perimeter = (length and width) X2

=2(a ten b)

Square perimeter = side length X4=4a