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Se considera expresia E (x) =2x-8 supra x la a 2-a - 8x+15 - 1 supra x-3:1 supra x la a 2-a - 25
Urgenta!


Răspuns :

E(x) =[2(x-4) / (x-3) (x-5)  - 1/x-3 ]: 1/(x-5)(x+5)
E(x) = [2x-8/(x-3)(x-5)  -  x-5/ (x-3)(x-5)] * (x-5)(x+5)
E(x) = [2x-8-x+5/ (x-3)(x-5)] * (x-5)(x+5)
E(x)= [x-3/ (x-3) (x-5)] * (x-5)(x+5)   se simplifica x-5 si x-3
E(x) = x+5