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saudiemtoan123
2 năm trước
tìm x: a, $\sqrt[2]{1-2x}$+ $\sqrt[2]{1+2x}$= $\sqrt[2]{\frac{\sqrt[2]{1-2x}}{\sqrt[2]{1+2x}}}$ +$\sqrt[2]{\frac{\sqrt[2]{1+2x}}{\sqrt[2]{1-2x}}}$ b, $\sqrt[4]{x}$+$\sqrt[4]{1-x}$+$\sqrt[2]{x}$-$\sqrt[2]{1-x}$=$\sqrt[2]{2}$+$\sqrt[4]{8}$ c, $\sqrt[2]{8+x^{3}}$+$\sqrt[2]{64-x^{3}}$= $x^{4}$-8$x^{2}$+28 d, $\sqrt[2]{2-x^{2}}$+$\sqrt[2]{2-\frac{1}{x^{2}}}$=4-(x+ $\frac{1}{x}$)
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