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1) Aplicand metoda gruparii termenilor descompuneti in factori ireductibili :7X la a 4 - 9X la a 3 - 7X la a 2 + 9X

2) Eliminati parantezele (5X-1)la a 2


Răspuns :

1) 2*7X²- 2*9x³.
2) (5x-1)*(5x-1)= 4x*4x=16x²