309期:〓〓半数01,02,03,05,06,09,19,20,21,23,26,27,30,31,33,34,35,39,42,43,44,46,47,49》开44准
310期:〓〓半数02,03,04,10,11,12,14,15,21,25,26,28,30,31,32,33,34,35,36,39,41,44,46,48》开19错
311期:〓〓半数02,05,08,09,11,13,15,16,17,22,23,24,25,26,27,28,29,36,38,39,40,44,46,47》开47准
312期:〓〓半数03,07,08,10,15,17,21,23,25,30,31,32,33,34,35,38,40,41,42,43,45,46,47,48》开？？