?? ???4.7?????????? ???????
????:1???????????:???????????
2???????
3?????????vx
4????
5?????
????11?22? (?? ???)??11??????22???20???40?????4.7??,?????????????
?,11??????????22?20??40???????????(???23.21??,?????????????120.23??)???????????????4.7?????,??????15????
?,???????????????????????????,????????????????????????
??????,??????,???????????,???
?,?200?5???4????321???,??????????2024???????4??3?7.3?,?168?????????????????(??) ??????:????