?????????2???????14????? ?14?????,?1????,???

??????????,??13???54?????????????,?30??????????63???,????????????15?????25??????

????????????????????,??????????????120???????,??(?)

?????????????:?????????? “????”_????

?? ???????????1???

????:1?????:??????

2????????vx

3???????

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

5?????????

?????????2???????14????? ?14?????,?1????,???

??????????,??13???54?????????????,?30??????????63???,????????????15?????25??????

????????????????????,??????????????120???????,??(?)

?????????????:??????????