X 2 x2 6x 12 1. 4x2+4x+1/x2-4 4x+2/6x-12. ((-X+1)^-1 - ((-X+4)^-1)^2 =<|X^2+6x|/. 2x-1/6-3x +2x+1/2x-4 -x+3/6x-12. X-4/X-2-X/2-X. (Х^2+2x+2)(x^2-x+1)=1. 3х 2 2х 3-3х 2+1. Х1+х2+х3= сигма1. Х+1 Х-1 формула. 2x+1/3-4x-x2/12 x2-4/9. (X+1)(X+2)−(X+2)(X+3). 1/2-X-1 1/X-2-6-X/3x