??????????????????? ???????澫???????? ???????澫???????????λ???

????????????????ξ?????????????

?????????100???????????20+50+50?????????????100?????????????????????????50(?????72??????????????60??)??????100????????????160??(????72????)????????50????50*2+60+60=220??(????????72????)?????60???????????

???????????200?????????????????2??50??(???????72*2)?????50*2+144/120*100(?????????)=220?????????200????????????72????(?????????60??)????260??????????200??????40????????e????????????????????????????????????

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