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$(x-1)\sqrt{x^2-2x+5}-4x\sqrt{x^2+1}\geq 2(x+1)$

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fifa

fifa

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Giải bất phương trình sau:

 $(x-1)\sqrt{x^2-2x+5}-4x\sqrt{x^2+1}\geq 2(x+1)$


Edited by fifa, 12-04-2014 - 11:10.





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