Calculez mai intai paranteza:
(x+1)/x -(x-1)/(x+1) +(1-x)/(x^2 +x)=
(x+1)/x -(x-1)/(x+1) +(1-x)/x(x+1)=
Aducem la acelasi numitor:
(x+1)^2 /(x(x+1)) -x(x-1)/(x(x+1)) +(1-x)/(x(x+1))=
(x^2+2x+1-x^2+x+1-x)/(x(x+1))=
2(x+1)/(x(x+1))=
2/x
E(x)=(2/x)*x(x+3)/2(x-2)=(x+3)/(x-2)
E(x)=(x+3)/(x-2)
''^''=la puterea
