OBLICZ: Plis na jutro plus PLISSSSSS!!!!!!

4 i 1/8 - 1 i 2/8= 3 i 9/8 - 1 i 2/8 = 2 i 7/8 8 i 7/9 - 6 i 8/9 = 7 i 16/9 - 6 i 8/9= 1 i 8/9 8 i 3/20 - 1 i 17/20 = 7 i 23/20 - 1 i 17/20= 6 i 6/20 6 i 6/25 - 5 i 8/25 = 5 i 31/25 - 5 i 8/25 = 23/25 13 i 11/13 - 12 i 12/13 = 12 i 24/13 - 12 i 12/13 = 12/13 25 i 3/17 - 18 i 4/17= 24 i 20/17 - 18 i 4/17 = 6 i 16/17