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b) (+2).(-5).(+4) = -40
d) (-7).(-1).(+5) = +35
Divisiones
a) (36/-9)*(-3) = 12 o podría ser (+36)/(-9).(-3) = 36/27
b) (42/-7)*(2) = -12 o podría ser (+42)/(-7)*(+2) = 42/-14
El resultado depende de la forma como estén agrupados