Кзнаменателю 120 дробь 1 18 1 24 1 60

1/8 = 15/120
120 : 8 = 15 - доп.множ. к 1/8 = (1*15)/(8*15) = 15/120

1/24 = 5/120
120 : 24 = 5 - доп.множ. к 1/24 = (1*5)/(24*5) = 5/120

1/60 = 2/120
120 : 60 = 2 - доп.множ. к 1/60 = (1*2)/(60*2) = 2/120