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02-04-2011 - 16:32
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30-03-2010 - 12:05
Cho $x>y. xy=1$ .CMR: $\dfrac{x^2+y^2}{x-y} \geq 2 \sqrt{2}$
27-03-2010 - 12:51
Mong mọi người làm giúp nhé.
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