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∵AD、BE是△ABC的中線,∴S△ABE=S△ACD=12S△ABC,∵S△ABF=S△ABE-S△AEF,S四邊形CEFD=S△ACD-S△AEF,∴S△ABF=S四邊形CEFD,即,△ABF與四邊形CEFD的面積相等.
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