1 câu trả lời
$\dfrac{1}{\sqrt{3}+1}$`-`$\dfrac{1}{\sqrt{3}-1}$ `-`$\dfrac{6\sqrt{1}}{3}$
`=` $\dfrac{(\sqrt{3}-1)-(\sqrt{3}+1)}{(\sqrt{3}-1)(\sqrt{3}+1)}$ `-2`
`=`$\dfrac{\sqrt{3}-1-\sqrt{3}-1}{2}$ `-2`
`=` $\dfrac{-2}{2}$ `-2`
`=-1-2`
`=-3`
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