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I sprowadzamy do wspólnego mianownika i wykonujemy redukcje.
(1/x-1) -( x+2/x^2+x+1)= (x^2+x+1/x^3-1)-[(x+2)(x-1)/x^3-1]=(x^2+x+1/x^3-1)-(x^2+x-2/x^3-1)=3/x^3-1 c.n.d