§ Задание 27
\[\boxed{\mathbf{3.}\mathbf{27}}\]
\[\textbf{а)}\ 2 \cdot b\]
\[\textbf{б)}\ 2 \cdot (a - b)\]
\[\textbf{в)}\ 5x - 9y\]
\[\textbf{г)}\ c \cdot (a + b)\ \]
\[\boxed{\mathbf{3.}\mathbf{27}}\]
\[\textbf{а)}\ 2 \cdot b\]
\[\textbf{б)}\ 2 \cdot (a - b)\]
\[\textbf{в)}\ 5x - 9y\]
\[\textbf{г)}\ c \cdot (a + b)\ \]