\nthroot{3}{y^{8}}

\nthroot{20}{x^{115}}

\nthroot{16}{3^{70}}

\nthroot{8}{7^{19}}

\nthroot{8}{y^{42}}

\nthroot{10}{7^{42}}

\nthroot{5}{y^{18}}

\nthroot{16}{x^{27}}

\nthroot{9}{3^{44}}

\nthroot{12}{7^{50}}

\nthroot{11}{7^{52}}

\nthroot{3}{3^{4}}

\nthroot{4}{7^{18}}

\nthroot{9}{7^{46}}

\nthroot{9}{y^{50}}

\nthroot{4}{x^{11}}

\nthroot{3}{7^{17}}

\nthroot{13}{y^{24}}

\nthroot{14}{x^{67}}

\nthroot{17}{y^{50}}

\nthroot{19}{3^{64}}

\nthroot{9}{7^{34}}

\nthroot{12}{3^{46}}

\nthroot{16}{y^{80}}