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2014-05-27T22:12:48+03:00
E(x)=[1/(x -2)   +x/(x² -4) ]: 2/ (x-2)(x+2)=
 
 =[1/(x-2) + x(/(x-2)(x+2) ]  * (x-2)(x+2)/2   aducem la acelasi numitor in 1 paranteza

=(x-2+x)/(x-2)(x+2) * (x-2)(x+2) /2 se simplifica

=(2x-2)/2= 

=2(x-1)/2=

=x-1