$a){81}^{\frac{1}{2}}=\sqrt{81}=9$

$b){27}^{\frac{1}{3}}=\sqrt[3]{27}=3$

$c){81}^{\frac{1}{4}}=\sqrt[4]{81}=3$

$d){64}^{\frac{1}{6}}=\sqrt[6]{64}=2$

$e){256}^{\frac{1}{4}}=\sqrt[4]{256}=4$

$f){1024}^{\frac{1}{10}}=\sqrt[10]{1024}=2$