问题标题:
找规律(数学){1}1/2,3/4,9/8,27/16········{2}1/2,1/3,1/4,1/9,1/8,1/27,.{3}2/5,1/5,1/15,1/30,1/90,.
问题描述:

找规律(数学)

{1}1/2,3/4,9/8,27/16········{2}1/2,1/3,1/4,1/9,1/8,1/27,.{3}2/5,1/5,1/15,1/30,1/90,.

常弘回答:
  (1)分子是乘3倍,分母乘2倍   (2)1/16,1/81   (3)1/180,1/540
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