Приводим к общему знаменателю, а потом сравниваем: 4/9 и 3/5; 20/45 и 27/45; 20/45< 27/45, значит 4/9< 3|5 7/14 и 6/12; 42/84 и 42/84; 7/14 = 6/12 17/12 и 13/12; 17/12 > 13/12 25/8 и 49/14; 175/56 и 196/56; 25/8< 49/14 11/3 и 19/4; 44/12 и 57/12; 11/3 < 19/4
4/9 и 3/5; 20/45 и 27/45; 20/45< 27/45, значит 4/9< 3|5
7/14 и 6/12; 42/84 и 42/84; 7/14 = 6/12
17/12 и 13/12; 17/12 > 13/12
25/8 и 49/14; 175/56 и 196/56; 25/8< 49/14
11/3 и 19/4; 44/12 и 57/12; 11/3 < 19/4