题目内容
口算:
| 80×0.3= | 1.1×0.9= | 7.1÷0.1= | 2.5×0.04= |
| 0.2÷0.4= | 4.2÷2.1= | 0.45÷45= | 2×0.5-2×0.5= |
| 80×0.3=24, | 1.1×0.9=0.99, | 7.1÷0.1=71, | 2.5×0.04=0.1, |
| 0.2÷0.4=0.5, | 4.2÷2.1=2, | 0.45÷45=0.01, | 2×0.5-2×0.5=0. |
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