2) (8/11+3/22):5/11=(16/22+3/22): 10/22=19/22: 10/22=19/10=1,9
4) 17/36 : (7/12-5/9)=17/36 : (21/36-20/36)=17/36: 1/36=17
6) 19/24 : (3/16+5/24)=38/48: (12/48+10/48)=38/48: 22/48=19/11=1 8/11
2)4/15 y=2/5
4/15y=6/15
y=6/15: 4/15
y=3/2
y=1,5
4)7/8y=14
y=14: 7/8
y=16
6) 9/10y=4 1/2
9/10y=9/2
y=9/2: 9/10
y=5