[重点]主攻270538头,主攻053849尾.
1,排除169头,491百,051十,尾716.
2,铁卒:20,25,70,75.
3,三字现:230,235,280,285,730,735,780,785.
4,二定:02XX,07XX.52XX,57XX,20XX,25XX,70XX,,75XX,X7X0.
5,三定:02X0,02X5,07X0,07X5,52X0,52X5,57X0,57X5,20X0,20X5.
6,直码:0240,0245,0740,0745,5240.5245,5740,5745,0790,0795.