P=\dfrac{ \sqrt{ x \phantom{\tiny{!}}} }{ \sqrt{ x \phantom{\tiny{!}}} -2 } + \dfrac{ \sqrt{ x \phantom{\tiny{!}}} }{ \sqrt{ x \phantom{\tiny{!}}} +2 } - \dfrac{ x-2 \sqrt{ x \phantom{\tiny{!}}} }{ x-4 } Q=\dfrac{ \sqrt{ x \phantom{\tiny{!}}} +2 }{ \sqrt{ x \phantom{\tiny{!}}} -2 } với x\geq...