Giải giúp mình với ạ

`a)` `((sqrtx+2)/(x-1` `-` `(sqrtx-2)/(x-2sqrtx+1))` `:` `(4x)/((x-1)^2`    `ĐK:` `x>=0;xne1`

`=` `((sqrtx+2)/((sqrtx-1)(sqrtx+1)` `-` `(sqrtx-2)/(sqrtx-1)^2)` `:` `(4x)/((x-1)^2`

`=` `((sqrtx+2)(sqrtx-1)-(sqrtx-2)(sqrtx+1))/((sqrtx-1)^2.(sqrtx+1)` `:` `(4x)/((x-1)^2`

`=` `(x-sqrtx+2sqrtx-2-x+sqrtx-2sqrtx-2)/((sqrtx-1)^2.(sqrtx+1)` `.` `(x-1)^2/(4x`

`=` `(-4)/(4x.(sqrtx+1)`

`=` `-1/(x.(sqrtx+1)`

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