1) 378 ⋅ 65 : 90 = 24570 : 90 = 273
2) 495 ⋅ 32 : 80 = 15840 : 80 = 198
3) 851 ⋅ 37 = 31487
4) 692 ⋅ 46 = 31832
5) 6 ⋅ 800 – 800 : 8 + 2 = 4800 – 100 + 2 = 4702
6) 6 ⋅ 800 – 800 : (8 + 2) = 4800 – 800 : 10 = 4800 – 80 = 4720