口算:0.4×0.02= 3.2+6.8= 0.39÷1.3= 2.4×2.5= 1÷0.125= 1-0.25= 0.62÷0.1= 99×0.25=
口算:0.4×0.02=3.2+6.8=0.39÷1.3=2.4×2.5=1÷0.125=1-0.25=0.62÷0.1=99×0.25=1.2×0.4+0.4×1.3=...
口算:0.4×0.02= 3.2+6.8= 0.39÷1.3= 2.4×2.5= 1÷0.125= 1-0.25= 0.62÷0.1= 99×0.25= 1.2×0.4+0.4×1.3= 4×(1.5+0.25)=
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