Giải giúp em với....

`[xsqrtx-1]/[(x+sqrtx+1)(sqrtx+2)]+[x+3sqrtx+5]/[sqrtx+2] (x>=0)`

`= [(sqrtx-1)(x+sqrtx+1)]/[(x+sqrtx+1)(sqrtx+2)]+[x+3sqrtx+5]/[sqrtx+2]`

`= [sqrtx-1]/[sqrtx+2]+[x+3sqrtx+5]/[sqrtx+2]`

`= [sqrtx-1+x+3sqrtx+5]/[sqrtx+2]`

`= [x+4sqrtx+4]/[sqrtx+2]`

`= [(sqrtx+2)^2]/[sqrtx+2]`

`= sqrtx+2`

(đpcm)