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A melhor resposta!
2013-09-06T23:30:13-03:00
2013-09-06T23:32:28-03:00
9/5 - 4/3 =

tira o m.m.c (5,3) = 15

     27 - 20
________________ = 7/15
           15

obs: 15:5 x 9 = 27
       15:3x4 = 20
3 4 3