?? ???:?????????????????????
![](https://image.chezhanri.com/2019/0307/20190307151954529.jpg)
????:1???????????:?????????
2???????????
3???????
4?????????
5???????????
6??????24??????,??????????????????,???????????«?????????»????????????,???????????,???,??“1+2+4”???“1+3+4”???????????“1+2+4”?,???????????????????????(????????????)????(?????????????????????????????????),???(??),??????????????“??”??????“1+3+4”????????????,???????????(??????????????????????????????????),????????????????????,??“?????????”???????,????????,????????,???????“??????”?(?????????????????????)
??????????????????:???????????????