Упростить : x^2-1/x^2+x+1 : x+1/x^3-1 + 2/1/x
= x^2 : x+1 + 2 = (x-1)(x+2)(x-1)(x^2+x+1) + 2x = 2x + (x-1)^2
x^2+x+1 x^3-1 1/x (x^2+x+1)(x+1)