умножаем обе дроби на 3, получаем 21/27 и 24/27,
21/27<22/27<24/27
21/27<23/27<24/27
7/9 = 7*3/9*3 = 21/27
8/9 = 8*3/9*3 = 24/27
ответ: 22/27 и 23/27.
