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2 năm trước
Cho A= $\sqrt{2}$ - $\sqrt{x+2\sqrt{2x-4}}$ a) Rút gọn A b) Tìm x để A = -1 Rút gọn A= $\frac{x-y+5\sqrt{x}+5\sqrt{y}}{\sqrt{x}+\sqrt{y}+5}$ B= $\sqrt{x-\sqrt{x^2-4}}$ × $\sqrt{x+\sqrt{x^2-4}}$
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