????:1?????300?3??????:????????????

2?????????150???

3?????????????

4???????????

5????????????

??,???«?????(??????????)»,???

??????????????3??????????????????????????????????????????????????????,???????????,????????????1?3?6?8?12?18?24?30?36???????????????,???????9????????????????????????????????????????

?0??6???????????,???????,?????????,???;????????????6????????????24?????,???????????????,????????,?????????;?????????????2?????????????????????3???,??????????????????????????,?????????????????,??,???????????,?????????30????????????

?????????,???????,?????????,???????,????,????????????????????????????,??????????????????????????????,???

???????????????,????????,???«3?????????????»,??????????????????????????,???,??????????,?????????????,??? ????????????:???????????????????????