Giải các hệ :
$\begin{array}{l}
1)\,\,\,\left\{ \begin{array}{l}
{y^{1 - \frac{2}{5}{{\log }_x}y}} = {x^{\frac{2}{5}}}\\
1 + {\log _x}\left( {1 - \frac{{3y}}{x}} \right) = {\log _x}4
\end{array} \right.\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(1)\\
2)\,\,\,\left\{ \begin{array}{l}
y.{x^{{{\log }_y}x}} = {x^{\frac{5}{2}}}\\
{\log _4}y.{\log _y}\left( {y - 3x} \right) = 1
\end{array} \right.\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(2)
\end{array}$