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H

huongmot

$\dfrac{x-2\sqrt{x-1}}{1-\sqrt{x-1}}$(đk: x>2)

$=\dfrac{x - 1 - 2\sqrt{x-1}+1}{1-\sqrt{x-1}}$

$=\dfrac{(\sqrt{x-1}-1)^2}{1-\sqrt{x-1}}$

$=1-\sqrt{x-1}$
 
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