\[\boxed{\ \mathbf{996\ (996)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]
\[l = 30\ дм.\]
\[a = l\ :12 = 30\ :12 =\]
\[= 2,5\ (дм) - сторона.\]
\[V = a^{3} = {2,5}^{3} = 2,5 \cdot 2,5 \cdot 2,5 =\]
\[= 6,25 \cdot 2,5 = 15,625\ \left( дм^{3} \right) -\]
\[объем\ куба.\]
\[Ответ:15,625\ дм^{3}.\]
\[\boxed{\mathbf{996}\mathbf{.}\mathbf{\ }}\]
\[1)\ \frac{8}{19} < \frac{x}{19} < 1\ \ \ \ \]
\[x = 9,\ 10,\ 11,\ 12,\ 13,\ 14,\ 15,\ 16,\ \]
\[17,\ 18.\]
\[2)\ \frac{1}{3} < \frac{x}{18} < \frac{5}{6}\text{\ \ \ }\]
\[\frac{6}{18} < \frac{x}{18} < \frac{15}{18}\text{\ \ \ \ }\]
\[x = 7,\ 8,\ 9,\ 10,\ 11,\ 12,\ 13,\ 14.\]