\[\boxed{\mathbf{Страница}\mathbf{\ 30}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[\boxed{\mathbf{97}\mathbf{.}\mathbf{\ }}\]
\[У\ Саши.\]
\[\boxed{\mathbf{98}\mathbf{.}\mathbf{\ }}\]
\[\boxed{\mathbf{99}\mathbf{.}}\]
\[234 - 169 = 65\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \]
\[503 + 278 = 781\]