Ответы на вопрос:
2/7 + 3/8 = 16/56 + 21/56 = 37/56, 5/6 - 4/9 = 15/18 - 8/18 = 7/18, 3 1/8 + 2 5/6 = 3 3/24 + 2 20/24 = 5 23/24, 5 11/12 - 3 7/18 = 5 33/36 - 3 14/36 = 2 19/36
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