298期:〓〓半数03,05,07,09,10,12,15,20,23,24,28,30,31,33,34,37,38,39,40,41,45,46,47,49》开31准
299期:〓〓半数01,03,06,07,10,11,14,15,19,21,25,26,27,28,29,30,34,35,36,37,38,39,46,47》开05错
300期:〓〓半数01,03,04,08,10,11,12,15,18,21,24,28,29,30,31,32,33,36,39,41,42,43,45,47》开？？