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6 целых - 2 целых 3/8
4 целых 5/9 + 3 целых 8/9
5 целых 6/13 - 1 целых 11/13

1) 6 - 2 3/8 = 5 8/8 - 2 3/8 = 3 5/82) 4 5/9 + 3 8/9 = 7 13/9 = 8 4/9 3) 5 6/13 - 1 11/13 = 4 19/13 - 1 11/13 = 3 8/13