\[\boxed{\mathbf{Страница}\mathbf{\ \ 74}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[\boxed{\mathbf{16}\mathbf{.}\mathbf{\ }}\]
\[3 + 3 = 6\ (см) - весь\ отрезок.\]
\[\boxed{\mathbf{17}\mathbf{.}\mathbf{\ }}\]
\[1)\ 14\ :7 = 2\ (м) - ширина\ \]
\[изгороди.\]
\[2)\ 2 \cdot (2 + 14) = 32\ (м) -\]
\[периметр\ изгороди.\]
\[Ответ:32\ м.\]
\[\boxed{\mathbf{18}\mathbf{.}\mathbf{\ }}\]
\[45\ :x = 3 \cdot 3\]
\[45\ :x = 9\]
\[x = 45\ :9\]
\[x = 5\]
\[\overline{45\ :5 = 3 \cdot 3}\]
\[9 = 9.\]
\[c\ :6 = 15\ :5\]
\[c\ :6 = 3\]
\[c = 3 \cdot 6\]
\[c = 18\]
\[\overline{18\ :6 = 15\ :5}\]
\[3 = 3.\]
\[\boxed{\mathbf{19}\mathbf{.}\mathbf{\ }}\]
\[(100 - 28)\ :8 = 72\ :8 =\]
\[= 9\ (книг) - со\ стихами\ на\ \]
\[одной\ полке.\]
\[Ответ:по\ 9\ книг.\]