(1/2+2/3)乘6/7简便计算

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问题描述:

(1/2+2/3)乘6/7简便计算

郎士宁回答:

  (1/2+2/3)*6/7

  =1/2*6/7+2/3*6/7

  =3/7+4/7

  =1