Réponse:
A= 10×(-3)×2×(-5)×(-6)
= -30×(-10)×(-6)
= 300×(-6)
= -1800
B= (-0,91)×0×(-5)
= 0×(-5)
= 0
C= (-8)×2,1×(1,25)
= -16,8×(-1,25)
= 21