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`((x+2)/(xsqrtx-1)+sqrtx/(x+1+sqrtx)+1/(1-sqrtx)):(sqrtx-1)/(2sqrtx).đkxđ:x>0;xne1`
`=((x+2)/((sqrtx-1)(x+sqrtx+1))+sqrtx/(x+sqrtx+1)-1/(sqrtx-1)).(2sqrtx)/(sqrtx-1)`
`=(x+2+sqrtx(sqrtx-1)-(x+sqrtx+1))/((sqrtx-1)(x+sqrtx+1)).(2sqrtx)/(sqrtx-1)`
`=(x+2+x-sqrtx-x-sqrtx-1)/((sqrtx-1)(x+sqrtx+1)).(2sqrtx)/(sqrtx-1)`
`=(2sqrtx(x-2sqrtx+1))/((sqrtx-1)^2(x+sqrtx+1))`
`=(2sqrtx(sqrtx-1)^2)/((sqrtx-1)^2(x+sqrtx+1))`
`=(2sqrtx)/(x+sqrtx+1)`
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