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

2???????vx

3?????

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????????????(??) ??:???????