口算．0.4×0.25= 3.2÷0.8= 1.25×7×0.8= 1÷8= 0.2×0.9+0.6×0.2= 6.2÷0.62= 2-2÷5= 1-0.
口算．0.4×0.25=3.2÷0.8=1.25×7×0.8=1÷8=0.2×0.9+0.6×0.2=6.2÷0.62=2-2÷5=1-0.08=0.5×0.1÷0.5×...
口算．0.4×0.25= 3.2÷0.8= 1.25×7×0.8= 1÷8= 0.2×0.9+0.6×0.2= 6.2÷0.62= 2-2÷5= 1-0.08= 0.5×0.1÷0.5×0.1= 0.01÷0.001×0.1=
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| 解：0.4×0.25=0.1 | 3.2÷0.8=4 | 1.25×7×0.8=7 | 1÷8=0.125 |
| 0.2×0.9+0.6×0.2=0.3 | 6.2÷0.62=10 | 2-2÷5=1.6 | 1-0.08=0.92 |
| 0.5×0.1÷0.5×0.1=0.01 | 0.01÷0.001×0.1=1 |
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