Respostas

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2014-04-28T19:45:15-03:00
a)7+(-1)=6
b)-6+(-2)=-8
c) 3+(+4)=12
d) 0+(-2)=-2
e)0+(+6)=+6
f)-1+(+1)=
0
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2014-04-28T19:46:36-03:00