1) 4/5 + 1/25 = 20/25 + 1/25 = 21/25
5/8 + 5/6 = 15/24 + 20/24 = 35/24 = 1 11/24
4/5 + 1/25 < 5/8 + 5/6, так как 21/25 < 1 11/24
2) 7/22 + 8/99 = 63/198 + 16/198 = 79/198 = 1580/3960
3/10 + 7/40 = 12/40 + 7/40 = 19/40 = 1881/3960
7/22 + 8/99 < 3/10 + 7/40, так как 1580/3960 < 1881/3960