Respuesta:
(+30) . (+10) = multiplica los números = 300
(+12) . (-5)= -(12×5) = - 60
(-10) . (+9)= multiplica los números= -(10×9) = -90
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Respuesta:
(+30) . (+10) = multiplica los números = 300
(+12) . (-5)= -(12×5) = - 60
(-10) . (+9)= multiplica los números= -(10×9) = -90