RESOLVA AS EXPRESSÕES NUMERICAS
A) 5 + (7-2) - (4+3)
B) -15 + [(-12) - (+4)] - (-7 - 4)
C) 45 - {51 + [(-3) - (+8)]}
A) 5 + (7-2) - (4+3)
B) -15 + [(-12) - (+4)] - (-7 - 4)
C) 45 - {51 + [(-3) - (+8)]}
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b) -15 + (-12-4) - (-11)= -15 -16 + 11= -20
c) 45 - (51 + (-3-8))= 45 - (51 + (-11))= 45 - (51 -11)= 45 -(40) = 5