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chonhoi110

pt $\Longleftrightarrow \dfrac{40}{31}=\dfrac{xyzt +xy + xt + zt + 1}{yzt + y + t}$

$\Longleftrightarrow 1+\dfrac{1}{3+\dfrac{1}{2+\dfrac{1}{4}}}=x+\dfrac{1}{y+\dfrac{1}{z+\dfrac{1}{t}}}$

$\Longrightarrow .....$
 
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