Răspuns :
amplificam termenii din pa rantteza si rezulta
E(x)=[(x-2+x+2)/(x+2)(x-2)]·(x-2)/2x
= 2x/(x+2)(x-2)·(x-2)/2x simplificam
=1/(x+2)
E(x)=[(x-2+x+2)/(x+2)(x-2)]·(x-2)/2x
= 2x/(x+2)(x-2)·(x-2)/2x simplificam
=1/(x+2)
aducem la acelasi numitor in paranteza pe prima cu x-2 si pe a doua cu x+2
[x-2+x+2 supra (x-2)(x+2)]*x-2 supra 2x
2x/ (x-2)(x+2) * x-2/ 2x se simplifica si ne da
1/x+2
[x-2+x+2 supra (x-2)(x+2)]*x-2 supra 2x
2x/ (x-2)(x+2) * x-2/ 2x se simplifica si ne da
1/x+2