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x la a doua minus 4 supra x la a doua minus 4x plus 4

Răspuns :

[tex] \frac{x^2-4}{x^2-4x+4} = \frac{(x+2)(x\not-2)}{(x-2)^{\not{2}}} = \frac{x+2}{x-2} [/tex]