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thuongtran120702
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1/ (x ²-2xy+y ²) (x-y) 2/ (x ²+2xy+y ²) (x+y) 3/ (3x-5) (2x+11)-(2x+3) (3x+7) 4/ y(y ³+y ²-3y-2)+(y ²-2) (y ²+y-1) 5/ 6x ²-(2x+5) (3x-2)
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