Resposta :
a)(-2)×(+3)×(+4)= -6 . 4 = -24
b)(+5)×(-1)×(+2)= -5 . 2 = -10
c)(-6)×(+5)×(-2)= -30 . (-2) = 60
d)(+8)×(-2)×(-3)= -16 . (-3) = -48
e)(+1)×(+1)×(+1)×(-1)= -1
f)(+3)×(-2)×(-1)×(-5)= -6 . (-1) . (-5) = 6 . (-5) = -30
g)(-2)×(-4)×(+6)×(+5)= -8 . 6 . 5 = -48 . 5 = -240
h)(+25)×(-20)= -500