问题标题:
4.61×3/7-5.39×(-3/7)-3×(-3/7)
问题描述:

4.61×3/7-5.39×(-3/7)-3×(-3/7)

汪雄良回答:
  4.61×3/7-5.39×(-3/7)-3×(-3/7)   =4.61×3/7+5.39×3/7+3×3/7   =(4.61+5.39+3)×3/7   =13×3/7   =39/7   =5又4/7
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