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2/ Thực hiện phét tính a) ( x - y ). ( $x^{2}$ + xy + $y^{2}$ ) b) ( x - 2 $y^{2}$ ) . ( $x^{2}$ + 2xy + 4 $y^{2}$ ) c) ( x - 1 ) . ( x - 2 ) . x d) 3$xy^{3}$ . ( $x^{3}$ - 2x -6 )
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