\[\boxed{\mathbf{254\ (252)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ (238 - 149) + 506 = 595\]
\[2)\ (48 + 16)\ :(48 - 16) = 2\]
\[3)\ (124 + 126) \cdot (313 - 307) =\]
\[= 1500\]
\[4)\ 32 \cdot 15 - 896\ :28 = 448\]
\[\boxed{\mathbf{254}\mathbf{\ (}\mathbf{с}\mathbf{)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\ 2318 + b + 6682 = 9000 + b\]
\[при\ b = 5195:\ \ \ \ \]
\[\ 9000 + 5195 = 14\ 195.\]
\[2)\ 829 - 329 + m = 500 + m\]
\[при\ m = 700:\ \ \ \]
\[\ 500 + 700 = 1200.\]