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2014-09-26T11:46:31+03:00
2014-09-26T11:52:06+03:00
A)(+9)-(+11)=9-11=-2
b)(-13)-(-4)=-13+4=-9
c)+43-(-12)=43+12=55
d)-21-(+19)=-21-19=-40
e)4+(-9+5)=4-4=0
f)-11-(+5-4)=-11-1=-12
2 4 2