-0.25/(-3/7)x(3/7)x(-1-1/5)

问题描述:

-0.25/(-3/7)x(3/7)x(-1-1/5)

-0.25/(-3/7)x(3/7)x(-1-1/5)
=-1/4x(-7/3)x(3/7)x(-6/5)
=-1/4x(-1)x(-6/5)
=-3/10