Respostas

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2014-09-01T20:07:35-03:00
A)   3/5 + (-1/3) = 3/5 - 1/3 = 9/15 - 5/15 = 4/15
b)   -5/8 - (3/4) = -5/8 - 3/4 = -5/8 - 6/8 = -11/8
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