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----- - -----=-------------=---------
8 7 56 56
suma de 3 5 21 + 20 41
---- + -----=-----------------=-------
4 7 28 28
¿Cuanto le falta a 13/56 para ser igual a 41/28?
13/56 + X = 41/28
2x 41 13 69
X = ----- - ------ = ---------
2 x 28 56 56
Respuesta : Le falta 69/56