3s=10-1+100-1+1000-1+10000-1+...+100...0-1(最后的2012个0)
3s=111...10-2012(被减数有2012个1)
3s=370.37000*3+110-2012
-------------------
670个370
3s=370.37000*3-1902
s=370.37000-634
s=370.36366
∴s的末四位数是6366
3s=10-1+100-1+1000-1+10000-1+...+100...0-1(最后的2012个0)
3s=111...10-2012(被减数有2012个1)
3s=370.37000*3+110-2012
-------------------
670个370
3s=370.37000*3-1902
s=370.37000-634
s=370.36366
∴s的末四位数是6366