\[\boxed{\text{11\ (11).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[\textbf{а)}\ 6 = 2 \cdot 2 + 2\]
\[\textbf{б)}\ 8 = 2 \cdot 2 \cdot 2\]
\[\textbf{в)}\ 3 = 2 + 2\ :2\]
\[\textbf{г)}\ 1 = 2 - 2\ :2\]