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=

解:0.4×0.25=0.13.2÷0.8=41.25×7×0.8=71÷8=0.125
0.2×0.9+0.6×0.2=0.36.2÷0.62=102-2÷5=1.61-0.08=0.92
0.5×0.1÷0.5×0.1=0.010.01÷0.001×0.1=1


分析:此題為小數(shù)四則運算的口算題,此題中的常做題和簡單題,即可直接寫出得數(shù),個別算式可用運算定律進(jìn)行簡便運算,如0.2×0.9+0.6×0.2可運用乘法分配律,轉(zhuǎn)化成0.2×(0.9+0.6)進(jìn)行計算,1.25×7×0.8可運用乘法交換律,轉(zhuǎn)化成(1.25×0.8)×7進(jìn)行計算.
點評:此題主要考查對小數(shù)四則運算的熟練計算和運算定律的靈活運用.
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