`#AkaShi`
`(-4x-9\sqrt{x}+3)/(x+3\sqrt{x}+2)+(\sqrt{x}-1)/(\sqrt{x}+1)-(2\sqrt{x}-1)/(\sqrt{x}+2)` Đk: `x >= 0`
`=(-4x-9\sqrt{x}+3)/(x+2\sqrt{x}+\sqrt{x}+2)+(\sqrt{x}-1)/(\sqrt{x}+1)-(2\sqrt{x}-1)/(\sqrt{x}+2)`
`=(-4x-9\sqrt{x}+3)/((\sqrt{x}+1)(\sqrt{x}+2))+(\sqrt{x}-1)/(\sqrt{x}+1)-(2\sqrt{x}-1)/(\sqrt{x}+2)`
`=(-4x-9\sqrt{x}+3)/((\sqrt{x}+1)(\sqrt{x}+2))+((\sqrt{x}-1)(\sqrt{x}+2))/((\sqrt{x}+1)(\sqrt{x}+2))-((2\sqrt{x}-1)(\sqrt{x}+1))/((\sqrt{x}+1)(\sqrt{x}+2))`
`=(-4x-9\sqrt{x}+3+x+\sqrt{x}-2-2x-\sqrt{x}+1)/((\sqrt{x}+1)(\sqrt{x}+2))`
`=(-5x-9\sqrt{x}+2)/((\sqrt{x}+1)(\sqrt{x}+2))`
`=(-5x-10\sqrt{x}+\sqrt{x}+2)/((\sqrt{x}+1)(\sqrt{x}+2))`
`=((\sqrt{x}+2)(-5\sqrt{x}+1))/((\sqrt{x}+1)(\sqrt{x}+2))`
`=(-5\sqrt{x}+1)/(\sqrt{x}+1)`