1/2 7/9 13/16 19/23 5/6 (
问题描述:
1/2 7/9 13/16 19/23 5/6 (
数量关系
答
分子依次增加6,分母依次增加7
1/2
7/9
13/16
19/23
25/30=5/6
31/37