Respostas

2013-07-03T19:48:21-03:00

11?

 

-18 + x = 7

18 - 7 = 11

 

-18+11 = 7

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2013-07-03T20:32:14-03:00

4+3, 5+2, 1+6, ... da 7

e 6X(-3), 9X(-2), e vice-versa...

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