Ответы на вопрос:
1) 5 1/13 - 3 6/13 = 4 14/13 - 3 6/13 = 1 8/13 2) 7 2/15 - (4 - 3 7/15) + 2 12/15 = 7 2/15 - (3 15/15 - 3 7/15) + 2 12/15 = = 7 2/15 - 8/15 + 2 12/15 = 6 17/15 - 8/15 + 2 12/15 = 8 21/15 = 9 6/15 = 9,4
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