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1 ae=ed=ad/2bf=fc=bc/2所以ae=cf又ab=cd be=根號下(ab²;+ae²;)=根號下(cd²;+cf²;)=df所以△ABE≌△cdf2 bf=bc/2=ad/2=de又ad‖bc所以de‖bf一組對邊平行且相等的四邊形是平行四邊形所以四邊形bf…
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