?? ?????????? ???????
????:1????????????:????????
2?????vx
3???????????
4???600??
5???????????
??11??22??? (??? ??????)11???????21????,????????,??,????15?????????,?15??????????????,13??????70??“????????”……???????????????????“??????”,???????,?????????????
??????? ?????,???????????,?????????????????????????????????????????????“????????????????”?,?????????????????????,?????,????????????????????,??“?????????”?????????????????????????????????????????????????,??????????????,????????“?????????????+??????????????”???????????????????,?????,????????????????,????????????????????,???
???????????,???????????????????????“???????????????”,?????????????????“?????????”?????????,?????????????????,?????????,??????????????????,??????“?????????+?????????”??,??????????????(??)
???:?????????????