5.
- \(320:40 = 8\)
- \(570:30 = 19\)
- \(354:3+512:4 = 118 + 128 = 246\)
- \(656:8-441:9 = 82 - 49 = 33\)
- \(9 \cdot 8:12 = 72:12 = 6\)
- \(56 \cdot 6:7 = 336:7 = 48\)
- \(400:100-40:10 = 4 - 4 = 0\)
- \(250 \cdot 4-100 \cdot 8 = 1000 - 800 = 200\)
Ответ: указаны в решении.