?? ??????????????????
????:1??????????:?????????????
2???????
3?????????
4????????????
5?????????vx
??1????20? (???? ????????)??????20???????,??,????????????
????«????????????????????(??????????????????????????????????)???»,?????????(??)??3??,????6000????,????15%????????????,???????????????????1?????,??500?????
20????,????????????????????????“?,??????????3999?????????,???500???,????????480??????????,??980????????????????????,????‘??????’?”??
???,??,???,????????“?”?,???????????????????????????????“?”?(????) ??????????:????????????