Với `x >= 0,x \ne 4,x \ne 9` có:
`P=[2\sqrt{x}-9]/[x-5\sqrt{x}+6]-[\sqrt{x}+3]/[\sqrt{x}-2]-[2\sqrt{x}+1]/[3-\sqrt{x}]`
`P=[2\sqrt{x}-9]/[(\sqrt{x}-2)(\sqrt{x}-3)]-[\sqrt{x}+3]/[\sqrt{x}-2]+[2\sqrt{x}+1]/[\sqrt{x}-3]`
`P=[2\sqrt{x}-9-(\sqrt{x}+3)(\sqrt{x}-3)-(2\sqrt{x}+1)(\sqrt{x}-2)]/[(\sqrt{x}-2)(\sqrt{x}-3)]`
`P=[2\sqrt{x}-9-x+9-2x+4\sqrt{x}-\sqrt{x}+2]/[(\sqrt{x}-2)(\sqrt{x}-3)]`
`P=[-3x+5\sqrt{x}+2]/[(\sqrt{x}-2)(\sqrt{x}-3)]`
`P=[(\sqrt{x}-2)(3\sqrt{x}+1)]/[(\sqrt{x}-2)(\sqrt{x}-3)]`
`P=[3\sqrt{x}+1]/[\sqrt{x}-3]`
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