\[Страница\ 6.\]
\[\boxed{\mathbf{7.}}\]
\[\textbf{а)}\ \]
\[\textbf{б)}\ \]
\[ИЛИ\]
\[\boxed{\mathbf{8.}}\]
\[\boxed{\mathbf{9.}}\]
\[(96 - 6 - 12)\ :3 = 78\ :3 =\]
\[= 26\ (книг) - осталось\ на\ \]
\[каждой\ полке.\]
\[Ответ:26\ книг.\]
\[\boxed{\mathbf{10.}}\]
\[\textbf{а)}\ x\ :11 \cdot 5 = 110\]
\[x\ :11 = 110\ :5\]
\[x\ :11 = 22\]
\[x = 22 \cdot 11\]
\[x = 242.\]
\[Ответ:242.\]
\[\textbf{б)}\ x\ :5 + 25 = 40\]
\[x\ :5 = 40 - 25\]
\[x\ :5 = 15\]
\[x = 15 \cdot 5\]
\[x = 75.\]
\[Ответ:75.\]
\[\textbf{в)}\ x \cdot 5\ :2 = 50\]
\[x \cdot 5 = 50 \cdot 2\]
\[x \cdot 5 = 100\]
\[x = 100\ :5\]
\[x = 20.\]
\[Ответ:20.\]