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thang9122001
2 năm trước
1.So sánh: a) $\sqrt{2}$ -1 với 1 b) $\sqrt{2}$ +1 với $\sqrt{5}$ 2.Tìm điều kiện xác định của x để các biểu thức sau có nghĩa a) $\sqrt{6}$ - 2x b) $\sqrt{2x}$ +6 c) $\sqrt[n]{}$ $\frac{1}{3x-1}$ d) $\sqrt[n]{}$ $\frac{x+2}{x-2}$
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