grazie mille
5.1
4x^3 - 4x^2 + x - 12x^2 y + 12xy - 3y;
x (4x^2 - 4x + 1) - 3y (4x^2 - 4x + 1);
(4x^2 - 4x + 1) (x - 3y);
4x^2 - 4x + 1 = (2x - 1)^2;
(2x - 1)^2 = 4x^2 - 4x + 1;
(4x^2 - 4x + 1) (x - 3y) =(2x + 1)^2 (x - 3y).
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