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10. Efectuați calculele: a) (2x + 3)² +5(x-1)²-(3x + 1)²; c) (x+3)(x-3)-(x + 1)²; e) 9(x + 1)(x-1)-(3x+1)²2²; g) 2(x + 5)2²-4(x+2)(x-2)+2x(x-3). DC b) (4x-3)²+(3x + 2)²-(5x-4)²: d) (x-1)(x+4)-(x-2)(x-2); f) (3x+5)(3x-5)-(5x+6)-(x+5)(x-5);​