`P=(1/(1+2sqrtx)+2/(1-2sqrtx)+(3sqrtx)/(4x-1)):(sqrtx-3)/(4x+4sqrtx+1)-1 \ (xge0,xne1/4)`

`P=(1/(1+2sqrtx)+2/(1-2sqrtx)-(3sqrtx)/(1-4sqrtx)) : (sqrtx-3)/(2sqrtx+1)^2-1`

`P=(1/(1+2sqrtx)+2/(1-2sqrtx)-(3sqrtx)/((1-2sqrtx)(1+2sqrtx))) . (2sqrtx+1)^2/(sqrtx-3)-1`

`P=((1-2sqrtx)+2(1+2sqrtx)-3sqrtx)/((1-2sqrtx)(1+2sqrtx)) . (2sqrtx+1)^2/(sqrtx-3)-1`

`P=(1-2sqrtx+2+4sqrtx-3sqrtx)/((1-2sqrtx)(1+2sqrtx)) . (2sqrtx+1)^2/(sqrtx-3)-1`

`P=(3-sqrtx)/((1-2sqrtx)(1+2sqrtx)) . (2sqrtx+1)^2/(sqrtx-3)-1`

`P=(-(sqrtx-3))/((1-2sqrtx)(1+2sqrtx)) . (2sqrtx+1)^2/(sqrtx-3)-1`

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

`P=(-2sqrtx-1-(1-2sqrtx))/(1-2sqrtx)`

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

`P=(-2)/(1-2sqrtx)`

`P=2/(2sqrtx-1)`

Vậy `P=2/(2sqrtx-1)`

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