(x+2)2 - x2 +4x + 4, (x - 3)2 - x2 - 6x + 9, (2x - 1)2 - 4x2 - 4x + 1, (3x + 2)2 - 9x2 + 12x +4, (5x +1)(5x - 1) - 25x2 - 1, (2y + x)(x - 2y) - x2 - 4y2, (4 +x)(x - 4) - x2 - 16, (0,2x - 0,1y)2 - 0,04x2 - 0,04xy + 0,01y2, (5x + 0,3)2 - 25x2 - 3x + 0,09,

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