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=
分析:此題為小數(shù)四則運(yùn)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(gè)別算式可用運(yùn)算定律進(jìn)行簡便運(yùn)算,如0.2×0.9+0.6×0.2可運(yùn)用乘法分配律,轉(zhuǎn)化成0.2×(0.9+0.6)進(jìn)行計(jì)算,1.25×7×0.8可運(yùn)用乘法交換律,轉(zhuǎn)化成(1.25×0.8)×7進(jìn)行計(jì)算.
解答:
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
點(diǎn)評(píng):此題主要考查對(duì)小數(shù)四則運(yùn)算的熟練計(jì)算和運(yùn)算定律的靈活運(yùn)用.
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