`(3x+5\sqrt{y}-11)/(y+\sqrt{y}-2)-(\sqrt{y}-2)/(\sqrt{y}-1)+2/(\sqrt{y}+2)-1 (đk:y≥0;y\ne1)`

`=(3x+5\sqrt{y}-11)/(y+2\sqrt{y}-\sqrt{y}-2)-(\sqrt{y}-2)/(\sqrt{y}-1)+2/(\sqrt{y}+2)-1`

`=(3x+5\sqrt{y}-11)/(\sqrt{y}(\sqrt{y}+2)-(\sqrt{y}+2))-(\sqrt{y}-2)/(\sqrt{y}-1)+2/(\sqrt{y}+2)-1`

`=(3x+5\sqrt{y}-11)/((\sqrt{y}-1)(\sqrt{y}+2))-(\sqrt{y}-2)/(\sqrt{y}-1)+2/(\sqrt{y}+2)-1`

`=(3x+5\sqrt{y}-11)/((\sqrt{y}-1)(\sqrt{y}+2))-((\sqrt{y}-2)(\sqrt{y}+2))/((\sqrt{y}-1)(\sqrt{y}+2))+(2(\sqrt{y}-1))/((\sqrt{y}+2)(\sqrt{y}-1))-((\sqrt{y}+2)(\sqrt{y}-1))/((\sqrt{y}+2)(\sqrt{y}-1))`

`=(3x+5\sqrt{y}-11-(y-4)+(2\sqrt{y}-2)-(\sqrt{y}+2)(\sqrt{y}-1))/((\sqrt{y}+2)(\sqrt{y}-1))`

`=(3x+6\sqrt{y}-7-2y)/((\sqrt{y}+2)(\sqrt{y}-1))`