3/7 = 3*4/7*4 = 12/28
4/7 = 4*4/7*4 = 16/28
Тогда 13/28, 14/28 = 1/2 и 15/28 подходят
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3/7 = 3*4/7*4 = 12/28
4/7 = 4*4/7*4 = 16/28
Тогда 13/28, 14/28 = 1/2 и 15/28 подходят