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480 = 2^5 x 3 x 5
640 = 2^7 x 5
800 = 2^5 x 5^2
el m.c.m se obtiene multiplicando los factores comunes y no comunes elevados a los mayores exponentes
por tanto m.cm = 2^7 x 3 x 5^2 = 9600
comprobamos
9600 / 480 = 20
9600 / 640 = 15
9600 / 800 = 12