????????????520 ?????????? ??????520?????????

?????????520??????????

????5.20-6.9????????????????????????裨????20?????????????????????520??????????????????????????????????????????????????????????

?????????·??????????????????????????????????e????????????????????

??????????ε??????й??

??λ???????10????????10????????????????????????20?????????30???????? (?????е?????)

????????????15??20???????15*20=300??

????????????25??30???????25*30=800??

?????????1100???????????????Σ????????20?????????1100???????55?Σ????????????70?????

55?ξ????55*70=3850????

?????е??????????????????????????????????????????????????????????

???????????????????????????????????????????????β???????1???????Σ?????????????????????η??!~

?????10??????????12????????1???????Σ???ο??????2??10???????20????仨??????15?????????

????????????????????????20*15=300?????????????????????3???????????????20????????????60?Σ?????????????

???12?????????8?????10????????? 8*10=80 ???????????20???????????100??????50??????????????????????50????20?????????1000?????????????3850????????4850????????·???2888???????????????????!~

?????????????黨??????????!~

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