Сравните дроби 1/7 и 4/21; 3/5 и 11/20; 4/9 и 8/15; 37/115 и 38/175; 3/5 и 8/15; 4/7 и 16/28; 5/12 и 7/18; 9/65 и 16/117 !

1/7 и 4/21 приводим к общему знам. 3/21<4/21
3/5=12/20>11/20
4/9=20/45, 8/15=24/45 20/45<24/45
37/115=1295/4025, 38/175=874/4025 1295/4025>874/4025
3/5=9/15 9/15>8/15
4/7=16/28=16/28
5/12=15/36, 7/18=14/36 15/36>14/36
9/65=81/585, 16/117=80/585 81/585>80/585