Calcule o valor das expressões numéricas:
a) 15+(-8) x (+3) =
b) (-5) x (+4) + (-15) ÷ (-5) =
c) (-9-3) ÷ (-2+6) =
d) (-5+3) x (2+7) =
e) -13+ (-800) ÷ 80 =
f) 5-(-4-9) ÷ (-13) =
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