Ответ:
\(304 \cdot 56 = 304 \cdot (50 + 6) = 15200 + 1824 = 17024\).
\(809 \cdot 43 = 809 \cdot (40 + 3) = 32360 + 2427 = 34787\).
\(407 \cdot 28 = 407 \cdot (20 + 8) = 8140 + 3256 = 11396\).
Ответ: 17024; 34787; 11396.
\(304 \cdot 56 = 304 \cdot (50 + 6) = 15200 + 1824 = 17024\).
\(809 \cdot 43 = 809 \cdot (40 + 3) = 32360 + 2427 = 34787\).
\(407 \cdot 28 = 407 \cdot (20 + 8) = 8140 + 3256 = 11396\).
Ответ: 17024; 34787; 11396.