Question

utilize as propriedades e calcule​

Answer 1

$\Large\boxed{\begin{array}{l}\underline{\rm Divis\tilde ao~de~radicais}\\\underline{\rm de~mesmo~\acute indice}\\\sf\sqrt[\sf n]{\sf\dfrac{a}{b}}=\dfrac{\sqrt[\sf n]{\sf a}}{\sqrt[\sf n]{\sf b}}\end{array}}$

$\boxed{\begin{array}{l}\sf\sqrt{\dfrac{81}{25}}=\dfrac{\sqrt{81}}{\sqrt{25}}=\dfrac{9}{5}\end{array}}$