Respostas

2014-04-06T10:32:39-03:00
A) -5/8 / 5/12= -5/8 • 12/5 = -60/40

b) -11/9 / -11/6= -11/9 • (-6/11) = +66/11

c) +14/15 / -21/25= 14/15 • (-25/21)= -350/415

Espero que entenda e que eu tenha ajudado
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