三角形ABC,AB=AC,

∵∠AEC＝∠AEC(公共角)、∠BDE＝∠CAE＝90度∴∠DBE＝∠ACE∴△BDE∽△AEC∴BD/AC＝DE/AE设AB＝AC＝2,则BC＝2√2又∵∠DBC＝60度∴∠DCB＝30度∴BD＝√2∴BD/AC＝DE/AE＝(√2)/2又S△BDE＝1/2×BD×DE,S△CAE＝1/2...