a³ - b³ = (a - b)(a² + ab + b²)
(2x-1)(4x^2+2x+1) - 4x(2x^2-3) = (2x-1)((2x)^2+2x+1²) - 8x^3 + 12x = 8x^3 - 1 - 8x^3 + 12x = 12x - 1
x = 0.5
12*(0.5) - 1 = 6 - 1 = 5
доказано
a³ - b³ = (a - b)(a² + ab + b²)
(2x-1)(4x^2+2x+1) - 4x(2x^2-3) = (2x-1)((2x)^2+2x+1²) - 8x^3 + 12x = 8x^3 - 1 - 8x^3 + 12x = 12x - 1
x = 0.5
12*(0.5) - 1 = 6 - 1 = 5
доказано