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efetue as multiplicaçoes
a) ( +7 ).( -5 )

b ( -9 ).( -2 )

c (+10 ).(+3 )

d) (-7 ).( -0 )

5 efetue as divisões
a) (-15:(+5)
b)(+32):( +4)
c)(-44):(-4)
d ) (+18):(-2)
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