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a) (3x+1)(x²-3x+5)-(x+2)(2x-7x+3)(x-1)(x²+x+1);
b) (2x-3)(2x²-4x-3)-(x-3)(3x²-5x-2)-(x+2)(x²-x+1);
(x²-2x+1)(x²+3x+3)-(x²-2x-3)(x²-x+2)-(x-2)(x²-3x+3);
c)
d) (x²+2x+5)(x²-3x-4)-(x²-2x-1)(x² + 3x + 1)-(x²+x+1)(x²-x+1).
Dau coroană pentru cine le rezolvă pe toate