\[\boxed{\ \mathbf{1492}\mathbf{\ (1200)}.\ Еуроки\ - \ ДЗ\ без\ мороки}\]
\[V_{пр\ I} = a_{I}b_{I}c_{I} = 320\ см^{2}.\]
\[a_{\text{II}} = \frac{a_{I}}{2};\text{\ \ }b_{\text{II}} = \frac{b_{I}}{2};\ \ c_{\text{II}} = \frac{c_{I}}{2}.\]
\[V_{пр\ II} = a_{\text{II}}b_{\text{II}}c_{\text{II}} = \frac{a_{I}}{2} \cdot \frac{b_{I}}{2} \cdot \frac{c_{I}}{2} =\]
\[= \frac{a_{I}b_{I}c_{I}}{8}\]
\[V_{пр\ II} = \frac{320}{8} = 40\ \left( см^{3} \right) - объем.\]
\[Ответ:40\ см^{3}.\]