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 Dau coroana ,URGENT!!!!!!!Aratati ca
n=(x2+x)(x2+x+2)+1 este patrat perfect


Răspuns :

(2x+x)(2x+x+2)+1=3x(3x+2)+1=3x*3x+3x+3x+1= factor comun 3x = 3x(3x+1)+(3x+1) = factor comun (3x+1) = (3x+1)(3x+1)=(3x+1)²