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因為AB平行於DC 所以∠AED=∠EAB,∠EBA=∠BEC 因為∠AED=∠BEC 所以∠EAB=∠EBA 所以三角形EAB是等腰三角形,EA=EB 所以三角形AED與三角形BEC全等.(兩邊及夾角相等) 所以AD=BC 所以梯形ABCD是等腰梯形
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