Respostas

2013-06-16T17:34:39-03:00

5/6-1/3 =

1/3 = 2/6 =>

5/6 - 2/6 = (5-2)/6 = 3/6 = 1/2

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(4/9) / (6/5) = 

(4/9) x (5/6) = 20/54 = 10/27

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5/3 x 4/2 =

20/6 = 10/3

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2/5 + 1/2=

1/2 = 5/10

e

2/5 = 4/10

=>

5/10 + 4/10 = 9/10

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