Respuestas

2014-02-02T12:55:56+01:00
9/12-3/8
(72-36)/72=36/72=3/8

8/6-2/4.
(32-12)/24=20/24=5/6

 1/9-1/12.
(12-9)/108=3/108=1/36

 8-3/2.
(16-3)/2=13/2

 6-2/3
16/3