47) Resolva as questões com um método,contém cálculo e o método usado.
a) 70 - (4 - 9) =
b) 95 + ( -7 + 3) =
c) -4 - (-7 + 8) =
d) 92 - (-5 - 8 - 7)
e) 6 + (7 - 5) + (8 - 4)
f) 80 - (4 + 7) - (-9 + 7)
g) 75 + (-7) - (-6 + 3 + 8)
h) 2 + (7 - 90) - (7 + 4 - 80)
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