Сравните дроби: 1) 3/10 и 4/15 2) 5/8 и 7/12 3) 4/9 и 5/12 4) 7/12 и 13/18 5) 5/6 и 7/9 6) 11/12 и 13/16 7) 9/14 и 13/21 8) 17/20 и 21/25 9) 13/16 и 19/24 10) 11/18 и 14/27 11) 9/20 и 13/30 12) 7/22 и 17/55 .

Приводим к общему знаменателю и сравниваем
9/30>8/30
15/24>14/24
16/36>15/36
21/36<26/36
15/18>14/18
44/48>39/48
27/42>26/42
85/100>84/100
39/48>38/48
33/54>28/54
27/60>26/60
35/110>34/110

1) 9/30>8/30
2) 15/24>14/24
3)16/36>15/36
4) 21/36<26/36
5) 45/54<42/54
6) 44/48>39/48
7) 27/42>26/42
8) 85/100>84/100
9) 39/48>38/48
10) 33/54>28/54
11) 27/60>26/60
12) 35/110>34/110