- 3/4х + 23/24х - 1/3х =
= - 18/24х + 23/24х - 8/24х = 23/24х - (18/24х + 8/24х) =
= 23/24х - 26/24х = - 3/24х = - 1/8х
Ответ: - 1/8х.
Пояснения:
3/4 = (3*6)/(4*6) = 18/24 - доп.множ.6
1/3 = (1*8)/(3*8) = 8/24 - доп.множ.8
3/24 = (3:3)/(24:3) = 1/8 - сократили на 3