`(\sqrt{x}-1)/(\sqrt{x})+(2\sqrt{x}+1)/(x+\sqrt{x}) ( x >= 0 )`
`=((\sqrt{x}-1)(\sqrt{x}+1))/(\sqrt{x}(\sqrt{x}+1))+(2\sqrt{x}+1)/(\sqrt{x}(\sqrt{x}+1))`
`=(x-1+2\sqrt{x}+1)/(\sqrt{x}(\sqrt{x}+1))`
`=(x+2\sqrt{x})/(\sqrt{x}(\sqrt{x}+1))`
`=(\sqrt{x}(\sqrt{x}+2))/(\sqrt{x}(\sqrt{x}+1))`
`=(\sqrt{x}+2)/(\sqrt{x}+1)`