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因為AB//DC,CE//DA 所以:四邊形AECD是平行四邊形 所以AE=CD,AD=CE 因為DC=8,DA=6 所以CE=6,AE=8 因為AB=12 所以BE=AB-AE=12-8=4 因為梯形ABCD是等腰梯形, 所以AB=CD=6 所以三角形CEB的周長為4+6+6=16
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