Сравните с 1/2 дроби: 5/7,10/21, 20/60.
1) 1/2 и 5/7 ; 7/14 и 10/14 ; 7/14<10/14 ; 1/2<5/7; 2)1/2 и 10/21; 21/42 и 20/42; 21/42>20/42; 1/2>10/21; 3)1/2 и 20/60 ; 30/60 и 20/60 ; 30/60>20/60; 1/2>20/60.
5/7>1/2,10/21>1/2,20/60>1|2. Я считаю так!