????:1????????????:????vx

2??????24????

3?????????

4??????????

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

?,????«??(??????????????????????)»,??????????????

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

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

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

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