Привести дробь 2/3 к дроби со знаменателем 9, 6, 15, 21.
2/3 = 6/9 2/3 = 4/6 2/3 = 10/15 2/3 = 14/21
2/3 = 6/9 = 4/6 = 10/15 = 14/21