72×0.81×10.4简便计算
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72×0.81×10.4
=(72*10+72*0.4)*0.81
=(720+28.8)*0.81
=720*0.8+720*0.01+28.8*0.8+28.8*0.01
=576+7.2+22.4+0.64+0.288
=598.4+7.2+0.64+0.288
=598.688+7.84
=606.528
=(72*10+72*0.4)*0.81
=(720+28.8)*0.81
=720*0.8+720*0.01+28.8*0.8+28.8*0.01
=576+7.2+22.4+0.64+0.288
=598.4+7.2+0.64+0.288
=598.688+7.84
=606.528
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