(1+1/6):(3/8-1/4)=9 1/3
1. 1+1/6= 1 1/6
2. 3/8-1/4=3/8-2/8=1/8
3. 1 1/6:1/8=7/6:1/8=7/6*8/1=7/3*4/1=28/3=9 1/3
(5/7-2/3):(4/9-5/12)=1 5/7
1. 5/7-2/3=15/21-14/21=1/21
2. 4/9-5/12=16/36-15/36=1/36
3.1/21:1/36=1/21*36/1=12/7=1 5/7
