5/9×(3/4÷1/10)=5/9×3/4×10=25/6
1/6+3/4×2/3÷2 =1/6+3/4×2/3×1/2=1/6+1/罩斗4=5/12
1/3×5/12+1/4×1/3=1/3×(5/12+1/4)=1/3×2/3=2/9
(2/18-1/54)÷1/54=2/18÷1/54-1/桥颂54÷1/54=2/18×54-1=6-1=5
18×1/3+6÷9/敏闷郑7=6+6×7/9=6+14/3=32/3(或者=10又3分之2)
[1/2-(3/4-3/5)]÷7/10=[1/2-3/20]×10/7=7/20×10/7=1/2
吹了你吧!
上课不认真啊?!