Правильно: 5 * 2/13 = 10/13 , 3 * 4/17 = 12/17, 2 * 8/9 = 16/9, 7 * 4/49 = 4/7, 7 * 3/40 = 21/40, 2/7 * 3/5 = 6/35, 3/4 * 5/6 = 15/24, Неправильно: 6/11 * 4/7 = 24/66, 2 * 8/13 = 16/26, 5 * 3/14 = 15/60, 4/7 * 7/9 = 4/10,

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