Efectuați: a) (2x+1)²-4x(x+1) b) (3x+2)²-3x(3x+4) c) (3x+4)²-(3x+2)(3x-2) d) (2x+5)²-4(x+2)(x-2) e)(4x-1)²-4(2x+3)(2x-3) f) (5x+1)(5x-1)-(4x-3) VĂ ROOOOOG E URGENT!!!!!!!DAU COROANA ​