Respostas

2013-03-30T11:59:16-03:00

10 + 11 + 15 + 20 = 56

( 20 + 11 ) - ( 10 + 15 ) = 6

( 20 + 10 ) - (15 + 11 ) = 4

( 20 + 15 + 11 ) - 10 = 36

 

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