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=
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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