?????????--???????????????
??????????Σ?????2????????2???????????2???????????????2???????????????2?????????????У????????????4????????????????????2?????????????????2???????????2???????????????2???????????????2??????ζ??2????????????????2?????????????????2???????????????????1??????????2??5?????к1????????1??5????????1???????????????2?????????2?????????1??5????????????У??????????????????1???????2???????????????2??????????2????
???????????????ú??????????????裬????????
?????????Ρ????麮?????????????????????????????????????????????????????????δ???????????????????????????????????????????С?????????????????????????????
???÷??????????100?裬???????????????????????????????????1??????????????10??С???廬??????3????????????÷???????????????彡??
?????????????????????