Respostas

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2014-03-19T11:00:06-03:00
A) 15/21+14/21=29/21
b) 4/6 +2/6=6/6=1
1 5 1
c) 10/15+12/15= 22/15
correcao da c 10/15 - 12/15= -2/15
d) -7/8 -3/4= -7/8-6/8= -13/8
1/2-10/2= -9/2