5/13=0······5 55/13=4······3 555/13=42······9 5555/13=427······4 55555/13=4273·······6 555555/13=42735······0 5555555/13=427350.5 100/6=36······4 所以是4
5/13=0······5 55/13=4······3 555/13=42······9 5555/13=427······4 55555/13=4273·······6 555555/13=42735······0 5555555/13=427350.5 100/6=36······4 所以是4