10 целых 5/15 + 9 целых 11/15 - 8 целых 1/30 =? 19 целых 1/17 - 8 целых 9/17 - 3 целых 15/17=?
(6 целых 7/12 + 8 целых 5/12) - 7 целых 16/21 - 4 целых 6/21=?
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