??????2??????????????????
?????????????????????????2016-09-27
??????2,??????2????,??????????
??????2??????????????????
??????????(31??)?????????????
????????????????25x31=775(????)
??????????????(?????1000)1000x31=31000(????)
?????????????????(????????)100x3x31=9300(????)
?????????????????10x31=310(????)
????μ????????(??3??)70x10x3=2100(????)
???????????????775+31000+9300+310+2100=43485(????)
????????=182375 ???????227100??????????44725????
????????43485???? ≈44725 (????)
??????????????????????80x4x31=9920(????)
??????Щ???????????????????+800;????????????????????????????????????????????????10????
?????????????????????????3500???????????
?????????????2??????????????????????????????????????
?????????????????
??????????2??????
???????:??????????????????40407?????????????40407???????????α? ????
