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是這樣做的 因為已知在四邊形ABCD中,AE平分∠BAD交BC於點E 所以∠BAE=∠EAD 又因為AB=BE 所以∠BAE=∠AEB 所以∠AEB=∠DAE(等量代換) 所以AD‖BC 因為AB‖CD 所以四邊形ABCD是平行四邊形 希望這樣是對的~
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