Respostas

2014-07-01T13:45:56-03:00
A) 4+ (-2)+(-8) = 4-2-8 = 4-10 = -6
b) 20-(-6+8)-(-1+3) = 20-(2)-(2) = 20-2-2 = 16
c) 35+(-3)-(-4+7+2) = 35-3 -5 = 35-8 = 27
d) 8+(-7)-(-12) = 8-7+12 = 13


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