1/5=3/15
1/3=5/15
5/6=15/18
3/18=3/18
1/6=2/12
1/4=3/12
б.
3/4=27/36
2/9=8/36
7/16=7/16
1/2=8/16
5/12=25/60
3/10=18/60
в.
4/7=48/84
5/12=35/84
2/3=10/15
1/15=1/15
2/9=12/72
7/12=42/72
г.
5/6=55/66
3/11=18/66
2/7=6/21
10/21=10/21
19/60=76/240
9/80=27/240