Respostas

2014-04-03T21:53:20-03:00
( -5 ) + ( -1 ) = -6
(-18) + ( -7 ) = -25
( -142) + ( -69 ) = -211
( -58 ) + ( -13 ) = -71
( +8 ) + ( -7) = +1
( +14 ) + ( -12 ) = 2
( -10 ) + ( 12 ) = 2
( +17) + ( -17 ) =
0
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