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6- Efetue as multiplicações:

a)(+3) . (+2) =

b)(+8) . (-4) =

c)(+10) .(+9) =

d)(−4) .(−7) =

e)(−4) .(−5). (+2) =

f)(−7) .(+2) . (−1) =

g)(−3) . (8 + 4) =

h)(+5) . (10 + 3) =