锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷邊锟叫撅拷锟侥斤拷锟絚锟斤拷锟斤拷锟侥碉拷锟斤拷c锟侥撅拷锟絰锟絚锟斤拷锟侥碉拷锟斤拷邊锟斤拷锟絚锟侥撅拷锟絰之锟饺烇拷2锟斤拷1锟斤拷锟斤拷锟侥猴拷锟斤拷锟斤拷锟斤拷3锟斤拷锟斤拷c锟組锟缴碉拷3锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷e锟斤拷锟�锟斤拷锟斤拷锟侥碉拷锟斤拷锟斤拷锟斤拷3锟斤拷锟斤拷c锟斤拷锟絰锟斤拷平锟斤拷锟斤拷锟斤拷小锟斤拷

锟斤拷锟斤拷1锟斤拷锟斤拷锟斤拷锟斤拷锟侥讹拷锟絰锟斤拷锟斤拷锟絴锟紺锟斤拷

锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟叫撅拷锟侥斤拷锟絚锟斤拷锟斤拷锟阶猴拷锟絯锟斤拷锟斤拷|锟斤拷锟絯锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷r锟斤拷锟斤拷锟斤拷锟絚該锟斤拷锟斤拷锟斤拷锟截合★拷

锟斤拷锟斤拷锟紺锟斤拷一

锟斤拷锟斤拷1锟斤拷锟斤拷锟侥碉拷锟斤拷c锟侥撅拷锟絰锟絚锟斤拷锟侥碉拷锟斤拷邊锟斤拷锟絚锟侥撅拷锟絰之锟饺烇拷2锟斤拷1锟斤拷

锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷知锟斤拷锟斤拷ABC锟斤拷E锟斤拷F锟斤拷AB锟斤拷AC锟斤拷锟斤拷锟絚锟斤拷EC锟斤拷FB锟斤拷锟斤拷G锟斤拷

锟斤拷锟斤拷锟斤拷锟紺锟斤拷EG=1/2CG

锟斤拷锟斤拷锟紺锟斤拷锟斤拷锟絕E锟斤拷EH锟斤拷BF锟斤拷AC锟斤拷H锟斤拷

锟斤拷锟斤拷锟斤拷AE=BE锟斤拷EH//BF

锟斤拷锟斤拷∴AH=HF=1/2AF(平锟叫撅拷锟街撅拷锟轿成憋拷锟斤拷锟斤拷锟斤拷)

锟斤拷锟斤拷锟街★拷 AF=CF

锟斤拷锟斤拷∴HF=1/2CF

锟斤拷锟斤拷∴HF:CF=1/2

锟斤拷锟斤拷锟斤拷EH锟斤拷BF

锟斤拷锟斤拷∴EG:CG=HF:CF=1/2

锟斤拷锟斤拷∴EG=1/2CG

锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷 锟紹锟斤拷EF

锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷

锟斤拷锟斤拷锟斤拷锟紺锟斤拷EG=1/2CG 锟斤拷锟紺锟斤拷EF=1/2BC

锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷位锟斤拷锟斤拷锟紺锟斤拷EF=1/2BC锟斤拷锟斤拷锟斤拷位锟斤拷锟斤拷锟紺锟斤拷EF=1/2BC

锟斤拷锟斤拷2锟斤拷锟斤拷锟侥猴拷锟斤拷锟斤拷锟斤拷3锟斤拷锟斤拷c锟組锟缴碉拷3锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷e锟斤拷锟�锟斤拷

锟斤拷锟斤拷锟紺锟斤拷锟斤拷锟斤拷锟斤拷

锟斤拷锟斤拷锟节★拷ABC锟斤拷锟斤拷锟斤拷邊锟斤拷a锟斤拷b锟斤拷c锟斤拷锟絚O锟斤拷該锟斤拷锟斤拷锟轿碉拷锟斤拷锟斤拷锟斤拷AOA'锟斤拷BOB'锟斤拷COC'锟街別锟斤拷a锟斤拷b锟斤拷c邊锟较碉拷锟叫撅拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟絴知锟斤拷

锟斤拷锟斤拷OA'=1/3AA'

锟斤拷锟斤拷OB'=1/3BB'

锟斤拷锟斤拷OC'=1/3CC'

锟斤拷锟斤拷锟絕O锟斤拷A锟街別锟斤拷a邊锟较革拷OH'锟斤拷AH

锟斤拷锟斤拷锟斤拷知OH'=1/3AH

锟斤拷锟斤拷锟絫锟斤拷S锟斤拷BOC=1/2×OH'a=1/2×1/3AHa=1/3S锟斤拷ABC

锟斤拷锟斤拷同锟斤拷锟斤拷锟紺S锟斤拷AOC=1/3S锟斤拷ABC

锟斤拷锟斤拷S锟斤拷AOB=1/3S锟斤拷ABC

锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷S锟斤拷BOC=S锟斤拷AOC=S锟斤拷AOB

锟斤拷锟铰高匡拷锟結訊锟斤拷锟竭匡拷锟斤拷锟斤拷锟斤拷锟斤拷前锟绞備、志愿锟斤拷锟�锟斤拷锟饺★拷謹锟斤拷锟斤拷锟�

锟斤拷锟斤拷锟竭匡拷锟絩锟絞锟斤拷锟斤拷全锟斤拷锟斤拷要锟斤拷(ji锟斤拷)锟絚

锟斤拷锟斤拷锟組锟斤拷"锟竭匡拷锟絎"微锟脚癸拷锟斤拷號