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05-05-2016 - 04:50
tìm các số x,y nguyên dương
$\left ( x^{2}-2 \right )\vdots \left ( xy+2 \right )$
03-05-2016 - 09:11
$(2x^{2}-2x+1)(2x+1)+(8x^{2}-8x+1)\sqrt{x-x^2}=0$