如何简便计算111111111\9?
问题描述：
如何简便计算111111111\9?
答
=100000000/9+10000000/9+1000000/9+100000/9+10000/9+1000/9+100/9+10/9+1/9=(99999999+1)/9+(9999999+1)/9+(999999+1)/9+(99999+1)/9+(9999+1)+(999+1)+(99+1)/9+(9+1)/9+1/9=(11111111+1/9)+(1111111+1/9)+(11111...