\nthroot{9}{x^{39}}

\nthroot{10}{7^{46}}

\nthroot{12}{x^{65}}

\nthroot{17}{y^{67}}

\nthroot{17}{7^{89}}

\nthroot{14}{7^{66}}

\nthroot{8}{x^{32}}

\nthroot{4}{x^{9}}

\nthroot{20}{7^{97}}

\nthroot{11}{7^{38}}

\nthroot{10}{3^{56}}

\nthroot{9}{x^{41}}

\nthroot{12}{x^{67}}

\nthroot{13}{x^{29}}

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

\nthroot{14}{x^{35}}

\nthroot{20}{y^{59}}

\nthroot{19}{7^{65}}

\nthroot{11}{7^{16}}

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

\nthroot{3}{x^{13}}

\nthroot{3}{y^{13}}

\nthroot{4}{x^{12}}

\nthroot{15}{y^{64}}