???????2??????1000????????
?????????????????????????2016-08-18
???????2,???????2??????,?????1000?????
1000?????620??????(300???????10?????????)
3????120?????
???????5?Σ????50?Σ?3???60?????3??270??
???3??180??????????60?Σ?3??2700??
3????????????120+60+180=360????
????????90????3??270?????2430??
???????=2430+270+2700=5400??
???????10????????=700??
??????6100???ж????????2700??
???????2??????????? ????1-13???????????
???????:??????????????????40407?????????????40407???????????α? may
