270期：01,02,03,04,06,08,11,13,15,17,18,20,21,24,26,29,30,31,33,34,35,38,41,43,44,45,46,47··（共半数）开35准
271期：01,02,05,07,08,10,13,14,15,16,17,18,19,21,22,23,24,27,29,31,35,36,38,39,41,42,45,46··（共半数）开06错
272期：01,03,05,06,09,10,11,14,15,16,18,19,21,22,23,24,27,29,30,31,37,40,42,43,44,46,47,48··（共半数）开？？！