4.32*0.15-0.248的简便方法怎么做

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4.32*0.15-0.248的简便方法怎么做
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4.32*0.15-0.248的简便方法怎么做
4.32*0.15-0.248的简便方法怎么做

4.32*0.15-0.248的简便方法怎么做
4.32*0.15-0.248
=4*(1.08*0.15-0.062)
=4*2*(0.54*0.15-0.031)
=4*2*(0.9*0.6*0.15-0.031)
=4*2*(0.9*0.09-0.031)
=8*(0.081-0.031)
=8*0.05
=0.4