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vaa rog mult 14 b) e urgent

Vaa Rog Mult 14 B E Urgent class=

Răspuns :

(3-x) / (3+x)+(3+x) / (3-x) +12x/ (x²-9) =(3-x) / (3+x)+(3+x) / (3-x) + (-12x)/ (9-x²)=

= [ (3-x²)+(3+x)²- 12x] / (3-x)(3+x)= (9-6x+x²+9+6x+x²- 12x) / (3-x)(3+x) =

=(18+ 2x² - 12x) / (3-x)(3+x) = 2*(9-6x+x²) / (3-x)(3+x)= 2*(3-x)²/ (3-x)(3+x) =

=2*(3-x)*(3-x) / (3-x)(3+x) = 2*(3-x) / 3+x = 2*(3-x) / (x+3)