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