Resposta :
Resposta:
a) -9 × (+12) × (-2) = - 216
b) -7 × (-10) × (-5) × (-2) = + 700
c) 7 × (-7) × (-2) × 5 = + 490
d) 20 × (-2) × 6 × 4 × (-1) = + 960
Resposta:
a) -9 × (+12) × (-2) = - 216
b) -7 × (-10) × (-5) × (-2) = + 700
c) 7 × (-7) × (-2) × 5 = + 490
d) 20 × (-2) × 6 × 4 × (-1) = + 960