giải giúp mình với ạ mình cần gấp: ($\sqrt{x}$ - $\frac{x+2}{ \sqrt{x} + 1 }$ ) : ( $\frac{\sqrt{x}}{\sqrt{x}+1}$ - $\frac{\sqrt{x}-4}{1-x}$ ) (x $\geq$ 0 ; x $\neq$ 1 )

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

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

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

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

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

`= (sqrtx - 2)/(sqrtx + 1)  . ((sqrtx - 1)(sqrtx + 1))/((sqrtx - 2)(sqrtx + 2))`

`=  (sqrtx - 1)/(sqrtx + 2)`