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Descompuneti in factor:
(x+1)³-(x-2)³


Răspuns :

(x+1-x+2)((x+1)²+(x+1)(x-2)+(x-2)²)
3(x²+2x+1+x²-x-2+x²-4x+4)
3(3x²-3x+3)
9(x²-x+1)