3.2×1.25×0.25.

解:3.2×1.25×0.25,
=(0.8×1.25)×(4×0.25),
=1×1,
=1.
分析:3.2×1.25×0.25.把3.2拆分為0.8×4,再運用乘法交換律和結(jié)合律進行簡算.
點評:此題考查的目的是使學(xué)生理解和掌握乘法的運算定律,并且能夠靈活運用運算定律對小數(shù)四則混合運算進行簡便計算.
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1÷2.5= 1.25×0.8= 3.2÷0.04= 0÷1.7=
0.22×102= 9.6÷0.8= 5×0.24= 4.5-0.05=
3.9÷0.13 16.5÷0.5= 5×0.12= 24×0.5=
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7.8÷0.01= 5.4÷0.6= 3.2÷5= 7×0.62=
0.56÷0.8= 7.4-2.8= 0.18÷0.2= 0.16÷8=
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0.61+0.39= 0.56÷28= 10÷20= 4.08÷0.4=
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2.3×100= 0.75×100= 0.108÷2= 10.8÷9=
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84÷0.21= 0.75÷0.25= 2.5×16= 0.108÷2=
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