Respostas

2014-05-18T18:16:04-03:00
(1/2 - 3/4):(1 - 2/5) = 
(1/4 - 3/4) : (5/5 - 2/5) = 
(-2/4) : (3/5) = 
(-2/4) x (5/3) = 
(-2x5) / (4x3)  
-10 / 12 --> simplificando: = -5/6