Решение:
1) \(247 \times 300 = 74100\)
2) \(59 \times 6000 = 354000\)
3) \(65 \times 8000 : 10000 = 520000 : 10000 = 52\)
4) \(80 \times 1250 : 1000 = 100000 : 1000 = 100\)
5) \(400 - 100 : (2 \times 500) = 400 - 100 : 1000 = 400 - 0.1 = 399.9\)
6) \(360 - 200 : (25 \times 40) = 360 - 200 : 1000 = 360 - 0.2 = 359.8\)