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Si es:
1/3 de 1/4 de 280 =
1/3 * 1/4 * 280 =
(1 * 1 * 280)/(3 * 4) = Simplificas el 4
70/3
Si es :
3/4 de 280 =
3/4 * 280 =
(3 * 280)/4 = Simplificas el 4
3 * 70 =
210