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84/60 + 20/60 + 9/60
113/60
Se simplifica dividiendo el numerador y el denominador por el mismo número. Se amplifica multiplicando a la vez por el mismo número.
-5/20 = simplificamos por 5 = -1/4
2/10 = 1/5
7/5 + 5/15 + [ 1/5 + 1/5 + (-1/4) ] =
7/5 + 5/15 + [ 1/5 + 1/5 - 1/4 ] =
7/5 + 5/15 + [ 2/5 - 1/4 ] =
7/5 + 5/15 + [ 8/20 - 5/20 ] =
7/5 + 5/15 + 3/20 =
21/15 + 5/15 + 3/20 =
26/15 + 3/20 =
104/60 + 9/60 =
113/60