Ивычислите 3/8x-1/6y-11/12x+1/4y; если x= -1 3/13 y= -24

= (3/8х - 11/12х) + (1/4у - 1/6у) = 
= (9/24х - 22/24х) + (6/24у - 4/24у) = - 13/24х + 2/24у
если х = - 1 3/13 = - 16/13;   у = - 24
- 13/24 * (-16/13) + 2/24 * (-24) = 16/24 - 2 = 2/3 - 2 = - (2 - 2/3) = - 1 1/3
ответ: - 1 1/3.