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 = 7/56 = 14/112 = 28/224, 1/7 = 8/56 = 16/112 = 32/224, значит:
1/8 < 15/112 < 1/7,
1/8 < 29/224 < 1/7,
1/8 < 31/224 < 1/7
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 = 7/56 = 14/112 = 28/224, 1/7 = 8/56 = 16/112 = 32/224, значит:
1/8 < 15/112 < 1/7,
1/8 < 29/224 < 1/7,
1/8 < 31/224 < 1/7