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Calculati:
(x-3)(x+3)-(x+3)² +3(2x+7)


Răspuns :

(x-3)(x+3)-(x+3)²+3(2x+7)=x²-3²-(x²+6x+3²)+6x+21=x²-9-x²-6x-9+6x+21=-18+21=3