30 ! решите примеры с дробями 3/5-1/4+1/3= 1/3-1/9+1/6= (2/3+1/9)-13/18= 3/4-1/2+7/8= 5/6-2/3+1/4= 1/3-(1/9+1/6)= решите уравнения с дробями 1/8+x=3/5 4/5-b=1/6 d+1/3=5/12 y-2/9=7/18 3/8-z=2/9 4/15+m=5/12

1/3-(1/9+1/6)=1/3-(4/36+6/36)=1/3-10/36=12/36-10/36=2/36=1/12
(2/3+1/9)-13/18=(6/9+1/9)-13/18=7/9-13/18=14/18-13/18=1/18
3/4-1/2+7/8=6/8-4/8+7/8=9/8

1/8+x=3/5
x=3/5-1/8
x=27/40-5/40
x=22/40
x=11/20