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8/9 - 2/9 = 6/9 = 2/3
7/15 + 1/15 + 12/15 = 20/15 = 4/3
3/20 + 7/20 + 5/20 = 15/20 = 3/4
b)8/9 - 2/9 = 6/9 simplificacion 2/3
c)7/15 + 1/15 + 12/15 = 20/15 simplificacion 4/3
d)3/20 + 7/20 + 5/20 = 15/20 simplificacion 3/4