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證明:在等腰梯形ABCD中AB=CD,∴∠BAD=∠CDA.∵EA=ED,∴∠EAD=∠EDA.∴∠EAB=∠EDC.(2分)在△ABE和△DCE中∵AB=DC∠EAB=∠EDCEA=ED,∴△ABE≌△DCE.(5分)∴EB=EC.(6分)
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