\nthroot{3}{\frac{x^{18}}{2^{21}}}

\nthroot{3}{\frac{7^{15}}{5^{27}}}

\nthroot{5}{\frac{7^{20}}{2^{10}}}

\nthroot{8}{\frac{3^{32}}{5^{32}}}

\nthroot{4}{\frac{3^{20}}{2^{24}}}

\nthroot{5}{\frac{3^{40}}{y^{35}}}

\nthroot{5}{\frac{7^{35}}{2^{25}}}

\sqrt{\frac{3^{4}}{y^{16}}}

\nthroot{5}{\frac{3^{15}}{2^{10}}}

\nthroot{8}{\frac{7^{16}}{y^{48}}}

\nthroot{3}{\frac{3^{9}}{y^{15}}}

\nthroot{8}{\frac{3^{16}}{y^{72}}}

\nthroot{8}{\frac{x^{56}}{5^{32}}}

\nthroot{6}{\frac{x^{18}}{5^{54}}}

\nthroot{7}{\frac{x^{42}}{y^{35}}}

\nthroot{7}{\frac{3^{28}}{2^{14}}}

\nthroot{3}{\frac{x^{12}}{5^{21}}}

\nthroot{8}{\frac{7^{24}}{y^{24}}}

\nthroot{9}{\frac{7^{18}}{5^{27}}}

\nthroot{9}{\frac{x^{45}}{5^{63}}}

\nthroot{8}{\frac{7^{24}}{5^{24}}}

\nthroot{3}{\frac{x^{21}}{2^{12}}}

\nthroot{8}{\frac{x^{40}}{2^{16}}}

\sqrt{\frac{x^{20}}{2^{6}}}