Объяснение:
(11-x)/(x-1) = x-4
(11-x)/(x-1) -(x-4) = 0
(11-x-(x-4)(x-1))/(x-1) =0
(11-x-(x^2-x-4x+4))/(x-1)=0
(11-x-x^2+5x-4)/(x-1)=0
(-x^2+4x+7)/(x-1) = 0
x ≠ 1
-x^2+4x+7 = 0
D = 16+28=44
x = (4±)/2
x = 2 ±
![\sqrt[]{44}](/tpl/images/1083/5668/9ee5b.png)
)/2![\sqrt[]{11}](/tpl/images/1083/5668/11d95.png)
