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Cum se calculeaza E(x) ?

Răspuns :

[tex]E_{(x)} = \frac{ x^{2} -6x+9}{ x^{2} -3x} \cdot \frac{ x^{2} +3x}{ x^{2} -9} = \frac{( x-3)^{2} }{x(x-3)}\cdot \frac{x(x+3)}{(x-3)(x+3)} =1[/tex]
asta dupa ce am aplicat formule de calcul si am facut simplificari