Ответы на вопрос:
10/24 - 21/54 = 5/12 - 7/18=15/36 - 14/36 = 1/36 30/54 + 22/30 = 5/9 - 11/15 = 25/45 - 33/45 = -8/45 28/40 - 10/75 = 7/20 - 2/15 = 21/60 - 8/60 = 13/60
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