?? ??? ???????????????30??
????:1?????:??????sn
2?100????
3????????
4???????????
5???????????
??6?????????????,??,????????????????????????????30????(???)
?????:??????????6?????????????,??,????????????????????????????30????(???)
?????:????????????:1?????:??????sn
2?100????
3????????
4???????????
5???????????
??6?????????????,??,????????????????????????????30????(???)
?????:????????