Question

IV) Efetue as operações:
(regra de sinal)

1) 21-17+5-9-15+8-6=
2) -10-[-6-(9-2-13)]=
3) (-2)(+42):(-7)-(-64):(+16)(-1)=
4) ((-3)(-4)-(-36):(+6)=

Answer 1

1) -13
2) -10
3) +8
4) +18