Сравни дроби 2/6 и 4/7; 3/7 и 4/5; 2/15 и 3/20

1) Приведем дроби к одному знаменателю:

2/6 = (7 * 2)/(6 * 7) = 14/42;

4/7 = (4 * 6)/(7 * 6) = 24/42;

14 < 24;

Ответ: 2/6 < 4/7.

2) 3/7 = (3 * 5)/(7 * 5) = 15/35;

4/5 = (4 * 7)/(5 * 7) = 28/35;

15 < 28;

Ответ: 3/7 < 4/5.

3) 2/15 = (4 * 2)/(15 * 4) = 8/60;

3/20 = (3 * 3)/(20 * 3) = 9/60;

8 < 9;

Ответ: 2/15 < 3/20.