4.Aplique as propriedades da multiplicação e calcule os produtos: a) (+1)•(-5) b) (-1)•(-5) c) (+9)•(-7)•(+6) d) (+4)•[(-7)+(-8)] e) (+2)•(-10) f) (-11)•(+1) g) (-11)•[(-12)•(+1)]•(-3) h) [(-5)-(-9)]•(+4)
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