3 3/7*3 1/2:(1 1/11-27/55)=20
1) 1 1/11-27/55=1 5/55-27/55=60/55-27/55=33/55=3/5
2) 3 3/7*3 1/2=24/7*7/2=12
3) 12:3/5=12*5/3=20
3 3/7*3 1/2:(1 1/11-27/55)=20
1) 1 1/11-27/55=1 5/55-27/55=60/55-27/55=33/55=3/5
2) 3 3/7*3 1/2=24/7*7/2=12
3) 12:3/5=12*5/3=20