180. 378⋅65:90 495⋅32:80 851⋅37 692⋅46 6⋅800−800:8+2 6⋅800−800:(8+2)

Решение:

1. 378 \(\cdot\) 65 : 90 = 24570 : 90 = 273

2. 495 \(\cdot\) 32 : 80 = 15840 : 80 = 198

3. 851 \(\cdot\) 37 = 31487

4. 692 \(\cdot\) 46 = 31832

5. 6 \(\cdot\) 800 - 800 : 8 + 2 = 4800 - 100 + 2 = 4700 + 2 = 4702

6. 6 \(\cdot\) 800 - 800 : (8 + 2) = 4800 - 800 : 10 = 4800 - 80 = 4720