9/10*1=9/10
1/2*1/7=1/14
3/5*5/9=1/3
4/5*10=8
3/7*1/2=3/14
5/9*1=5/9
6/7*2/3=4/7
5/8:1/4=5/8*4/1=5/2=2 1/2
9/10*1=9/10
1/8:1/4=1/8*4/1=1/2
5/6:1/2=5/6*2/1=5/3=1 2/3
6:9/10=6*10/9=20/3=6 2/3
2:2/5=2*5/2=5
3:3/7=3*7/3=7
3/7:14=3/7*1/14=3/98
3/5*5/7=3/7
1/9:1/3=1/9*3/1=1/3
4/5*5=4
5/12:1/6=5/12*6/1=5/2=2 1/2
1/2:3/8=1/2*8/3=4/3=1 1/3