问题标题:
巧算(有小数点):一、8.6×2.7+0.86×720+0.86二、3.4×5.2+0.34×47+0.34
问题描述:

巧算(有小数点):一、8.6×2.7+0.86×720+0.86二、3.4×5.2+0.34×47+0.34

潘启敬回答:
  8.6×2.7+0.86×720+0.86   =0.86×27+0.86×720+0.86×1   =0.86×(27+720+1)   =0.86×748   =643.28   3.4×5.2+0.34×47+0.34   =0.34×52+0.34×47+0.34   =0.34×(52+47+1)   =0.34×100   =34
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