2/11+5/11, 1/8+4/8,6/15-4/15,11/25-3/25,3/9+2/9-4/9,5/18+12/18-9/18,12/19-1/19-5/19,25/23-10/23+3/23.
2/11+5/11=7/11 1/8+4/8= 5/8 6/15-4/15=2/15 11/25-3/25= 9/25 3/9+2/9-4/9= 1/9 5/18+12/18-9/18= (17-9)/18 =8/18= 4/9 12/19-1/19-5/19= 6/19 25/23-10/23+3/23= 18/23
2/11+5/11=7/11 1/8+4/8=5/8 6/15-4/15=2/15 11/25-3/25=8/25 3/9+2/9-4/9=1/9 5/18+12/18-9/18=8/18 12/19-1/19-5/19=6/19 25/23-10/23+3/23=18/23