Calcule a parcela desconhecida em cada caso a) (-12)+(__)= -12
b)(-8)-(__)= +4
c)(-16)-(__)=-7
d) (+19)+(__)= +12
e)(__)+(-6)= -4
f)(__)-(+9)= -12
j)(-16)+(__)= +9
b)(-8)-(__)= +4
c)(-16)-(__)=-7
d) (+19)+(__)= +12
e)(__)+(-6)= -4
f)(__)-(+9)= -12
j)(-16)+(__)= +9
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