8/9-1/3÷7/18×2/3=8/9-1/3×18/7×2/3=8/9-4/7=20/631/7-1/9×63-2/3=1/7-7-2/3=-7又11/218/15×3/4+7/16-1/4=2/5+7/16-1/4=32/80+35/80-20/80=47/80
你这是几年级题