[重点]主攻381605头,主攻273816尾.
1,排除497头,276百,492十,495尾.
2,铁卒:30,35,80,85.
3,三字现:320,325,370,375,820,825,870,875.
4,二定:3X0X,3X5X,8X0X,8X5X,3XX2,3XX7,8XX2,8XX7,83XX,88XX.
5,三定:330X,335X,380x,385X,830X,835X,880X,885X,38X2,38X7.
6,直码:8302,8307,8352,8357,8802,8807,8852,8857,3802,3857.