脱式计算(用自己喜欢的方法计算).
| 102×4.5= | 4.5×7.3+2.7×4.5 | 0.85×0.4×2.5 |
| 8×(20-1.25) | 125×0.32×25 | (15.6+1.32÷0.3)×0.5. |
| 102×4.5= | 4.5×7.3+2.7×4.5 | 0.85×0.4×2.5 |
| 8×(20-1.25) | 125×0.32×25 | (15.6+1.32÷0.3)×0.5. |