(4/ ((x^2 + 1)/(2 - x))) * x^2 + 4x + 4/3 = (4 * (( 2 - x )/( x^2 + 1 ))) * х^2 + 4x + 4/3 = ((8 - 4x)/( x^2 + 1 )) * x^2 + 4x + 4/3 = (8x^2 - 4x^2)/(x^2 + 1) + (12x + 4)/3 = 4x^2/(x^2 + 1) + (12x + 4)/3 = (12x^2 + (12x + 4)(x^2 + 1))/ (12x+4)/(3x^2 + 3) = (12x^2 + 12x^3 + 12x + 4x^2 + 4)/ (3x^2 + 3) = (12x^3 + 16x^2 + 12x + 4)/(3x^2 + 3) = (4x(3x^2 + 3) + 16x^2 + 4)/(3x^2 + 3) = 4x + 16x^2 +4 = 16x^2 + 4x + 4 = 4(4x^2 + x + 1)
ответ: 4(4x^2 + x + 1).
(4/ ((x^2 + 1)/(2 - x))) * x^2 + 4x + 4/3 = (4 * (( 2 - x )/( x^2 + 1 ))) * х^2 + 4x + 4/3 = ((8 - 4x)/( x^2 + 1 )) * x^2 + 4x + 4/3 = (8x^2 - 4x^2)/(x^2 + 1) + (12x + 4)/3 = 4x^2/(x^2 + 1) + (12x + 4)/3 = (12x^2 + (12x + 4)(x^2 + 1))/ (12x+4)/(3x^2 + 3) = (12x^2 + 12x^3 + 12x + 4x^2 + 4)/ (3x^2 + 3) = (12x^3 + 16x^2 + 12x + 4)/(3x^2 + 3) = (4x(3x^2 + 3) + 16x^2 + 4)/(3x^2 + 3) = 4x + 16x^2 +4 = 16x^2 + 4x + 4 = 4(4x^2 + x + 1)
ответ: 4(4x^2 + x + 1).