giúp em với ạ cần gấp

`C=(\sqrt{x} + 1/(\sqrt{x}+1) ) . (1- (\sqrt{x}+2)/(x+\sqrt{x}+1))`     (ĐKXĐ: `x≥0`)

`= ( (\sqrt{x}(\sqrt{x}+1))/(\sqrt{x}+1) +1/(\sqrt{x}+1)) . ((x+\sqrt{x}+1)/(x+\sqrt{x}+1) - (\sqrt{x}+2)/(x+\sqrt{x}+1))`

`= (x+\sqrt{x}+1)/(\sqrt{x}+1) . (x+\sqrt{x}+1-\sqrt{x}-2)/(x+\sqrt{x}+1)`

`= (x+\sqrt{x}+1)/(\sqrt{x}+1) . (x-1)/(x+\sqrt{x}+1)`

`= (x+\sqrt{x}+1)/(\sqrt{x}+1) . ((\sqrt{x}+1)(\sqrt{x}-1))/(x+\sqrt{x}+1)`

`= \sqrt{x}-1`