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  • Câu hỏi:

    Rút gọn của biểu thức \(P = \frac{{\sqrt {x\sqrt {x\sqrt {x\sqrt x } } } }}{{{x^{\frac{{11}}{{16}}}}}}\left( {x > 0} \right).\)

    • A. \(P = \sqrt[{16}]{x}.\)
    • B. \(P = \sqrt[{8}]{x}.\)
    • C. \(P =x^\frac{7}{16}.\)
    • D. \(P = \sqrt[{4}]{x}.\)

    Đáp án đúng: D

    \(P = \frac{{\sqrt {x\sqrt {x\sqrt {x\sqrt x } } } }}{{{x^{\frac{{11}}{6}}}}} = \frac{{{x^{\frac{1}{2} + \frac{1}{4} + \frac{1}{8} + \frac{1}{{16}}}}}}{{{x^{\frac{{11}}{{16}}}}}} = \frac{{{x^{\frac{{15}}{{16}}}}}}{{{x^{\frac{{11}}{{16}}}}}} = {x^{\frac{4}{{16}}}} = {x^{\frac{1}{4}}} = \sqrt[4]{x}.\)

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