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1) Tính a) (x^2 - 2x +3 ) (x-4) b) (2x^2 - 3x -1) (5x+2) c) (25x^2 + 10xy + 4y^2) (5x-2y) d) (5x^3 - x^2 + 2x -3) (4x^2 -x +2)
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