Verified answer

3/42 = (3:3)/(42:3) = 1/14 - сократили на 3

1/14 = (1·5)/(14·5) = 5/70 - доп. множ. 5

1/14 = (1·2)/(14·2) = 2/28 - доп. мнж. 2

1/14 = (1·7)/(14·7) = 7/98

Ответ: 1/14 = 2/28 = 3/42 = 5/70 = 7/98.