Răspunsuri

2014-02-07T17:46:26+02:00
E(x)=(x-1-x^2/x+2)*x+2/x-2
{(x-1)( x+2) - x^2/x+2}  *x+2/x-2
{x^2+2x-x-2-x^2/x+2}*x+2/x-2
x-2/x+2 * x+2/x-2
E(x)=1
2014-02-07T17:48:47+02:00
E(x)= {x-1-x^2/x+2}*x+2/X-2
aducem la acelasi numitor si obtinem:
{(x-1) (x+2) -x^2/x+2}*x+2/x-2
{x^2+2x-x-2-x^2/x+2}*x+2/x-2
x-2/x+2 * x+2 /x-2=1