0.09×515.4×1.2简便方法
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0.09*515.4*1.2
=0.09*1.2*515.4
=0.108*515.4
=51.54+0.008*515.4
=51.54+0.8*5.154
=51.54+4+0.8*0.154
=55.54+0.12+0.0032
=55.6632
=0.09*1.2*515.4
=0.108*515.4
=51.54+0.008*515.4
=51.54+0.8*5.154
=51.54+4+0.8*0.154
=55.54+0.12+0.0032
=55.6632
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