Giải các hệ :
$\begin{array}{l}
1)\,\,\,\left\{ \begin{array}{l}
2{\log _{1 - x}}\left( { - xy + y - 2x + 2} \right) + {\log _{2 + y}}{\left( {x - 1} \right)^2} = 6\\
{\log _{1 - x}}\left( {y + 5} \right) - {\log _{2 + y}}\left( {x + 4} \right) = 1
\end{array} \right.\\
2)\,\,\,\left\{ \begin{array}{l}
{\log _{1 + x}}{\left( {y - 1} \right)^2} + {\log _{1 - y}}{\left( {x + 1} \right)^2} = 4\\
{\log _{1 + x}}\left( {2y + 1} \right) + {\log _{1 - y}}\left( {2x + 1} \right) = 2
\end{array} \right.
\end{array}$
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