Giải các hệ :
$\begin{array}{l}
1)\,\,\,\left\{ \begin{array}{l}
x + {2^{y + 1}} = 3\\
4x + {4^y} = 32
\end{array} \right.\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,3)\,\,\,\left\{ \begin{array}{l}
x + {3^{y - 1}} = 2\\
3x + {9^y} = 18
\end{array} \right.\\
2)\,\,\left\{ \begin{array}{l}
\sqrt y + \log {x^2} = 2\\
y + 4\log x = 28
\end{array} \right.\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,4)\,\,\,\left\{ \begin{array}{l}
\sqrt y + 2\log x = 3\\
y - 3\log {x^2} = 1
\end{array} \right.
\end{array}$