3/7+5/6 11/12-7/8 5/14·7/30 1 8/25·1 4/11 5/9: 10/27 4 4/9: 1 2/3 3/5+7/9 8/9-13/15 6/25·5/18 2 1/10·1 1/14 3/8: 9/16 7 11/12: 3 1/6

3/7+5/6=18/42+35/42=53/42=1 11/42
5/14*7/30=1/12
1 8/25*1 4/11=33/25*15/11=3/5
5/9:10/27=5/9*27/10=3/2=1 1/2
4 4/9:1 2/3=40/9:5/3=40/9*3/5=8/3=2 2/3
3/5+7/9=27/45+35/45=62/45=1 17/45
8/9-13/15=40/45-39/45=1/45
6/25*5/18=1/15
2 1/10*1 1/14=21/10*15/14=9/4=2 1/4
3/8:9/16=3/8*16/9=2/3
7 11/12:3 1/6=95/12:19/6=95/12*6/19=5/2=2 1/2