5/11:3=5/11*1/3=5/33
8/7:2=8/7*1/2=4/7
1/4:3=1/4*1/3=1/12
10/21:5=10/21*1/5=2/21*1/1=2/21
56/13:7=56/13*1/7=8/13*1/1=8/13
14/15:12*14/15*1/12=7/15*1/6=7/90
27/11:18=27/11*1/18=3/11*1/2=3/22
5 7/13:4/39=72/13*39/4=18/1*3/1=54
4 3/8:5 1/4=35/8:21/4=35/8*4/21=5/2*1/3=5/6
10 3/5:1 23/30=53/5:53/30=53/5*30/53=30/5=6
1 7/25:2 8/25=32/25:58/25=32/25*25/58=32/58=16/29