\[\boxed{\mathbf{1200}\mathbf{.}}\]
\[1)\ E =\]
\[= - 3 \bullet \frac{2}{7} - 1 \bullet \frac{3}{7} + 1 \bullet \frac{1}{7} + 3 \bullet \frac{1}{7} =\]
\[= \frac{- 6 - 3 + 1 + 3}{7} = - \frac{5}{7}.\]
\[2)\ E =\]