????:1???????:????sn????

2??????

3????????

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

5?????????150????

?11????30? (??????????? ?)11???????30??????????????,?????,?,??????????????????????????30??,12?1?3????,??,???????????????????????????12??

30??????,??????????????????,?????????????,??11?????????????30?????????12?1????????,??12??????????1????2??

??????,??????10?????????????,???????20???????,????????

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

?,12???????1????????????3?,??????4?????????6?,??????,??????????????????8?????????10?,????????12???4??6???????????????????,?7?????????????????8?,?9???

??,???????????,????????????,11?30?12??????????????2??????????,?????????????????????,??

12????2??????5??????,??????,??????????????????

?,??,???????,??,?????????????,??,???????????,??,?????,??,??????????????,?????(??) ??:???????