1)
4/9 = 8/18 = 12/27 и 5/9 = 10/18 = 15/27, значит:
4/9 < 1/2 < 5/9, где 1/2 = 9/18,
4/9 < 13/27 < 5/9 и 4/9 < 14/27 < 5/9,
2)
1/8 = 7/54 = 14/108 = 28/216, 1/7 = 8/54 = 16/108 = 32/216, значит:
1/8 < <strong>15/108 < 1/7,
1/8 < <strong>29/216 < 1/7, 1/8 < 31/216 < 1/7