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thuong30092005
2 năm trước
a)x^3-2x^2y+xy^2-9x b) (x+y)^2-(x-y)^2 c) (3x+1)^2-(x+1)^2 d) 25^2-15^2 e) x^2-x-y^2-y h) x^2-2xy+y^2-z^2 g) 5x-5y+ax-ay m) a^3-a^3x-ay+xy
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