A = `(\frac{\sqrt{x}-2}{x - 2\sqrt{x}+1)-frac{\sqrt{x}}{x-1})`.`(\frac{-x\sqrt{x}+ \sqrt{x}-2x+2}{\sqrt{x}+2})`
ĐKXĐ: x lớn hơn hoặc bằng 0, x khác 1
= `(\frac{\sqrt{x}-2}{(\sqrt{x}-1)^2}-\frac{\sqrt{x}}{(\sqrt{x}-1).(\sqrt{x}+1))).(\frac{-\sqrt{x}(x-1)-2(x-1)}{\sqrt{x}+2})`
= `(\frac{x + \sqrt{x}-2\sqrt{x}-2-x+\sqrt{x}}{(\sqrt{x}-1)^2.(\sqrt{x}+1)}).(\frac{-(x-1)}{1})`
= `\frac{-2}{(\sqrt{x}-1)^2.(\sqrt{x}+1)}.[-(\sqrt{x}-1).(\sqrt{x}+1)]`
= `\frac{2(\sqrt{x}-1).(\sqrt{x}+1)}{(\sqrt{x}-1)^2.(\sqrt{x}+1)}`
= `\frac{2}{\sqrtx-1}`
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