1-) Efetue as subtrações a seguir.

a) (+17)-(+9)=
b) (-15)-(-7)=
c) (-23)-(-4)=
d) (-42)-(-7)-(-8)=
e) (+5)-(-21)-(+9)=
f)(71)-0=

POR FAVOR ME AJUDEM NESSA ATIVIDADE !!!
E PRA AMANHÃ...
Tchau
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