Đáp án+Giải thích các bước giải:
`P=(\frac{x+2}{\sqrt{x}+1}-\sqrt{x}):(\frac{\sqrt{x}-4}{1-x}-\frac{\sqrt{x}}{\sqrt{x}+1})(x≥0;x\ne1)`
`P=(\frac{x+2-x-\sqrt{x}}{\sqrt{x}+1}):(\frac{\sqrt{x}-4-\sqrt{x}(1-\sqrt{x})}{(1-\sqrt{x})(1+\sqrt{x})})`
`P=\frac{2-\sqrt{x}}{\sqrt{x}+1}:\frac{\sqrt{x}-4-\sqrt{x}+x}{(1-\sqrt{x})(1+\sqrt{x})}`
`P=\frac{2-\sqrt{x}}{\sqrt{x}+1}.\frac{(\sqrt{x}-1)(\sqrt{x}+1)}{(2-\sqrt{x})(2+\sqrt{x})}`
`P=\frac{\sqrt{x}-1}{\sqrt{x}+2}`
