Explicación paso a paso:
[tex]1) \: \: \sqrt{ \frac{64}{100} } = \frac{8}{10} = \frac{4}{5} [/tex]
[tex]2) \: \: \sqrt{ \frac{49}{81} } = \frac{7}{9} [/tex]
[tex]3) \: \: \sqrt[3]{ \frac{8}{27} } = \frac{2}{3} [/tex]
[tex] \sqrt[4]{ \frac{16}{81} } = \frac{2}{3} [/tex]
