Răspuns :
[tex][tex]( x-1 - \frac{x^2}{x+2} ) : \frac{x-2}{x+2} \ aducem \ la \ acelasi \ numitor \ in \ paranteza \\ \frac{(x-1)(x+2)-x^2}{x+2} : \frac{x-2}{x+2}= \\ \frac{x^2+2x-x-2-x^2}{x+2} * \frac{x+2}{x-2}= \\ \frac{x-2}{x+2} * \frac{x+2}{x-2} =1 \ prin \ simplificare \[/tex]
Am vazut poza:
[tex]E(x) = (x - 1 - \frac{ x^{2}}{x+2}): \frac{x-2}{x+2} = [/tex]
[tex]= \frac{(x - 1)(x + 2) - x^{2} }{x + 2} * \frac{x + 2}{x - 2} = [/tex]
[tex]= \frac{(x-1)(x+2) - x^{2} }{x - 2} = \frac{ x^{2} - x+2x - 2 - x^{2} }{x - 2} = \frac{x - 2}{x - 2} = 1 [/tex]
[tex]E(x) = (x - 1 - \frac{ x^{2}}{x+2}): \frac{x-2}{x+2} = [/tex]
[tex]= \frac{(x - 1)(x + 2) - x^{2} }{x + 2} * \frac{x + 2}{x - 2} = [/tex]
[tex]= \frac{(x-1)(x+2) - x^{2} }{x - 2} = \frac{ x^{2} - x+2x - 2 - x^{2} }{x - 2} = \frac{x - 2}{x - 2} = 1 [/tex]