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2 năm trước
Cho A= ($\frac{\sqrt{x}+1}{\sqrt{x}-1}$ - $\frac{\sqrt{x}-1}{\sqrt{x}+1}$):($\frac{1}{\sqrt{x}+1}$ -$\frac{\sqrt{x}}{1-\sqrt{x}}$ + $\frac{2}{x-1}$) a,Rút gọn A b,Chứng minh A≥0 c,So sánh A với 1
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