`\frac{\sqrt{2+x}-\sqrt{2-x}}{\sqrt{2+x}+\sqrt{2-x}}=\sqrt{2}`
`<=>\frac{\sqrt{x+2}-\sqrt{-x+2}}{\sqrt{x+2}+\sqrt{-x+2}}=\sqrt{2}`
`<=> \frac{(\sqrt{x+2}-\sqrt{-x+2})(\sqrt{x+2}-\sqrt{-x+2})}{(\sqrt{x+2}+\sqrt{-x+2})(sqrt{x+2}-\sqrt{-x+2})}=\sqrt{2}`
`<=> x=∅`
Tính
`\frac{2+x}{x-2}`
`=1+\frac{4}{x-2}`