Cứu bài này giúp với các mom

`P=(6/(\sqrt{x}+1)+6/(\sqrt{x}-1)-(2x)/(x-1)):2/(x-1)(x>=0;x\ne1)`

`=(6/(\sqrt{x}+1)+6/(\sqrt{x}-1)-(2x)/((\sqrt{x}-1)(\sqrt{x}+1)))*(x-1)/2`

`=(6(\sqrt{x}-1)+6(\sqrt{x}+1)-2x)/((\sqrt{x}-1)(\sqrt{x}+1))*(x-1)/2`

`=(6\sqrt{x}-6+6\sqrt{x}+6-2x)/((\sqrt{x}-1)(\sqrt{x}+1))*(x-1)/2`

`=(12\sqrt{x}-2x)/((\sqrt{x}-1)(\sqrt{x}+1))*((\sqrt{x}-1)(\sqrt{x}+1))/2`

`=(12\sqrt{x}-2x)/2`

`=(2(6\sqrt{x}-x))/2`

`=6\sqrt{x}-x`