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4 2/7- 1 3/7 = 2 6/7
2 1/4 - 3/5 = 2 5/20 - 12/20 = 1 25/20 - 12/20 = 1 13/20
7 5/9 -2 2/3 = 7 5/9 - 2 6/9 = 6 14/9 - 2 6/9 = 4 8/9
5 - 7/8 = 4 1/8
14 5/9 - 1 7/8 = 14 40/72 - 1 63/72 = 13 102/72 - 1 63/72 = 12 39/72
prosze licze na naj :D