2.1×0.3=0.56÷7=
2.5×8×0.1=1÷0.25=
0.1×3.9=0.5×2.3×2=
3÷0.1=0.35÷0.35=
1.8+1.2×5=

解:
2.1×0.3=0.630.56÷7=0.08
2.5×8×0.1=21÷0.25=4
0.1×3.9=0.390.5×2.3×2=2.3
3÷0.1=300.35÷0.35=1

分析:根據小數(shù)乘除法的計算方法進行解答即可.
點評:此題考查了小數(shù)乘除法的口算能力,注意運算符號,細心計算即可.
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2.1×0.3= 0.56÷7=
2.5×8×0.1= 1÷0.25=
0.1×3.9= 0.5×2.3×2=
3÷0.1= 0.35÷0.35=
1.8+1.2×5=

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1.23÷3= 0.8×11= 1-0.75=
1.7×0.4= 0.36÷12= 1.6+0.38=
1.2÷0.3= 0.75×4= 15×0.4=
2.14-0.9= 4×0.25= 10÷2.5=
0.4×52= 1.6×0.4= 9.6÷6=
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1.23÷3=0.8×11=1-0.75=
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(11)12.5÷0.1         0.32÷0.8         1.6+3.7          0.45×0.2
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