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.....4×2×-9
.......8×-9
.......-72
b)(-4)x(+1)x0
......-4×1×0
.......-4×0
........-0
c)(+39x(-5)x(+2)
....(39×-5)×2
......-195×2
........-390
d)(+3)x(+4)x(-7)
.....3×4×-7
.......12×-7
........-84
Eso es todo....Salu2..No te olvides ponerme como la Mejor Respuesta!!