Правильно: 12/6 = 2, 1/3 = 3/9, 9/12 = 3/4, 6/16 = 3/8, 1/6 = 3/18, Неправильно: 2/4 = 1/3, 1/5 = 5, 6/16 = 2/9, 2/5 = 10/15, 3/12 = 1/3,

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