问题标题:
98.1*0.01+5*9.81+0.049*981
问题描述:

98.1*0.01+5*9.81+0.049*981

李美清回答:
  原式   =981×0.001+981×0.05+981×0.049   =981×(0.001+0.05+0.049)   =981×0.1   =98.1
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