题目内容
直接写出得数.
| 3.9×5= | 3.9×0.5= | 0.39×5= | 0.039×0.05= |
| 4.2÷7= | 4.2÷0.7= | 0.42÷7= | 0.42÷0.07= |
| 3.9×5=19.5, | 3.9×0.5=1.95, | 0.39×5=1.95, | 0.039×0.05=0.00195, |
| 4.2÷7=0.6, | 4.2÷0.7=6, | 0.42÷7=0.07, | 0.42÷0.07=6. |
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