如图 OE=3OB. OF=4OC, OG=-2OAOE+OF=OG 即2OA+3OB+4OC=0
S(OAB)=S(OBG)/2=S(OEG)/6
S(OBC)=S(OEC)/3=S(OEF)/12=S(OEG)/12
S(OCA)=S(OCG)/2=S(OFG)/8=S(OEG)/8
∴S(OAB)∶S(OBC)∶S(OCA)=1/6∶1/12∶1/8=4∶2∶3
如图 OE=3OB. OF=4OC, OG=-2OAOE+OF=OG 即2OA+3OB+4OC=0
S(OAB)=S(OBG)/2=S(OEG)/6
S(OBC)=S(OEC)/3=S(OEF)/12=S(OEG)/12
S(OCA)=S(OCG)/2=S(OFG)/8=S(OEG)/8
∴S(OAB)∶S(OBC)∶S(OCA)=1/6∶1/12∶1/8=4∶2∶3