Respostas

2012-12-16T22:22:18-02:00

a ) (-3ab²) . (4b) = -12ab3

b) (7x²y) . (7xy) = 49x3 y2

c) (10a³b³) : (2ab) = 5a2 b2

d) ( 30 a³b²c) : ( 6abc) = 5a2 b