\[\boxed{\mathbf{256\ (254)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ 2318 + b + 6682 = 9000 + b\]
\[при\ b = 5195:\ \ \ \ \]
\[\ 9000 + 5195 = 14\ 195.\]
\[2)\ 829 - 329 + m = 500 + m\]
\[при\ m = 700:\ \ \ \]
\[\ 500 + 700 = 1200.\]
\[\boxed{\mathbf{252\ (256)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]
\[a = 86 - 5b\]
\[1)\ b = 17:\]
\[a = 86 - 5 \cdot 17 = 86 - 85 = 1.\]
\[2)\ b = 9:\]
\[a = 86 - 5 \cdot 9 = 86 - 45 = 41.\]