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2014-08-24T14:49:57-03:00
A - 4/2 . 3/2= 12/4=3
b- 7/9 . 3 / 14 = 21/126 = 3 /18 = 1/6
c- 6 /2 :7 = 6/2 . 1/7 = 6/14= 3/7
d- 14/3. 3/21 =42/63
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