8÷7=1.1
88÷7=12.4
888÷7=126.6
8888÷7=1269.5
88888÷7=12698.2
888888÷7=126984
888888÷7=1269841.1
..
.
6个一循环
2012÷6=335.2
所以,888888.888（2012个8）÷7商是整数时,余数是4.