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(4 x 3) x 5 = 4 x (3 x 5)
12 x 5 4 x 15
60 60
(10 x 9)x 7 = 10 x (9 x 7)
90 x 7 10 x 36
360 360
Modulativa
500 x 1 = 500 100 x 1 = 100