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Cum se descompune x^2-6x+5?

Răspuns :

x^2-x-5x+5=x (x-1)-5 (x-1)=(x-1)(x-5)
[tex]x^2-6x+5=\underbrace{x^2-x}-\underbrace{5x+5}=x(x-1)-5(x-1)=(x-1)(x-5)[/tex]