решение смотри на фотографии
(a - b)³ = a³ - 3a²b + 3ab² - b³
8x^3 -36x^2 + 54x - 27 = 0
8(x^3 - 9/2x^2 + 27/4x - 27/8) = 0
(x)^3 - 3*3/2*(x)^2 + 3*(3/2)^2*x - (3/2)^3) = 0
(x - 3/2)^3 = 0
x = 3/2
решение смотри на фотографии
(a - b)³ = a³ - 3a²b + 3ab² - b³
8x^3 -36x^2 + 54x - 27 = 0
8(x^3 - 9/2x^2 + 27/4x - 27/8) = 0
(x)^3 - 3*3/2*(x)^2 + 3*(3/2)^2*x - (3/2)^3) = 0
(x - 3/2)^3 = 0
x = 3/2