?? ??????? ??????????
????:1?????????????:????????????
2????????????
3?????vx
4???????
5??????????
??11?22????????????? (???????? ?????????)11????????21????????,????????,????????????,????????????????15????????????,????????15????????????,13?????70??“??????????”……??????????????????????????????????“?????????”,?????????,??????????
?? ???????,??????????,?????????????“???????”?????????,???????????????????????,????????????????,???????????,??“??????????????????”????????????????????????????,??????????????????????????,?????????????“??????????+???????????????”????,????,??,??????????????????????????????????,???
??????,?????????????“???”,????????????????“???”?????,????????????????????????,??????????,??,?????“??+???”??????????????,???????(????????????????????????????????)
???????:??????????