Пошаговое объяснение:
№2
а) 13/27 - 1/9 = 13/27 - 3/27 = 10/27
б) 2/15 + 3/12 = 8/60 + 15/60 = 23/60
с) 3/28 - 2/21 = 9/84 - 8/84 = 1/84
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Пошаговое объяснение:
№2
а) 13/27 - 1/9 = 13/27 - 3/27 = 10/27
б) 2/15 + 3/12 = 8/60 + 15/60 = 23/60
с) 3/28 - 2/21 = 9/84 - 8/84 = 1/84