\[\boxed{\mathbf{Страница}\mathbf{\ 58}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[\boxed{\mathbf{40}\mathbf{.}\mathbf{\ }}\]
\[1)\ В\]
\[2)\ А\]
\[3)\ в\ 2\ раза\]
\[4)\ на\ 15\ см\ \]
\[5)\ 4\ см\]
\[\boxed{\mathbf{41}\mathbf{.}\mathbf{\ }}\]
\[a \cdot 3 = 248 + 598\]
\[a = 846\ :3\]
\[a = 282.\]
\[b\ :8 = 268\ :4\]
\[b\ :8 = 67\]
\[b = 67 \cdot 8\]
\[b = 536.\]