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1 1/7 - 5/7 = 8/7 - 5/7 = 3/7
1 2/3 - 4/9 = 5/3 - 4/9 = 15/9 - 4/9 = 11/9 = 1 2/9
1 1/10 - 5/10 = 11/10 - 5/10 = 6/10
Pierwszego nie wiem jak zrobić.