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Alexandraion8
a fost răspuns

x=radical(x+2013)(x-2013)(totul sub radical)

Răspuns :

[tex]x=\sqrt{(x-2013)(x+2013)}\\ x=\sqrt{x^2-2013^2}\\ Ridicam\ la\ patrat\:\\ x^2=x^2-2013^2\\ 0=2013^2(F)\ deci\ x\ nu\ apartine\ lui\ R[/tex]