Giải các hệ :
$1)\,\,\,\left\{ \begin{array}{l}
{\log _2}xy = 5\\
{\log _{\frac{1}{2}}}\frac{x}{y} = 1
\end{array}
\right.\,\,\,\,\,(1)\,\,\,\,\,\,\,\,\,\,\,\,2)\,\,\,\,\left\{
\begin{array}{l}
xy = 64\\
{\log _x}y = 5
\end{array} \right.\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(2)$