5.6*69.32+138.64*0.05+693.2*0.43 简便算法
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5.6*69.32+138.64*0.05+693.2*0.43
=5.6*69.32+6.932+693.2*0.43
=56x6.932+6.932+6.932x43
=6.932x(56+43+1)
=6.932x100
=693.2
=5.6*69.32+6.932+693.2*0.43
=56x6.932+6.932+6.932x43
=6.932x(56+43+1)
=6.932x100
=693.2
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