?? ???:?????????????????
????:1???????:????
2?????vx
3????????
4?????????
5????????????
????????????11????23?????????????(????? ????)11???23???????????????????,???????,??????????????????,???????
???????????????,??,???????????????????????????????,???????????????????????????????,??,????????????????????????
??????,??????????,????????????,????,??????,??????,????;???????????????????????,????????????????????,??,?????,?????
?,????????????????????????,???????,?????????(?????????????) ?????????????:?????????????