问题标题:
9.81*0.1+0.5*98.1+0.049*981的简便计算
问题描述:

9.81*0.1+0.5*98.1+0.049*981的简便计算

程贵和回答:
  9.81*0.1+0.5*98.1+0.049*981   =9.81*(0.1+5+4.9)   =9.81*10   =98.1
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