在四边形abcd中,ab=dc,ac=db.过点a作ae平行dc交cb的延长线于点e,求证:四边形aecd是平行四边形
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![在四边形abcd中,ab=dc,ac=db.过点a作ae平行dc交cb的延长线于点e,求证:四边形aecd是平行四边形](/uploads/image/z/1499046-6-6.jpg?t=%E5%9C%A8%E5%9B%9B%E8%BE%B9%E5%BD%A2abcd%E4%B8%AD%2Cab%3Ddc%2Cac%3Ddb.%E8%BF%87%E7%82%B9a%E4%BD%9Cae%E5%B9%B3%E8%A1%8Cdc%E4%BA%A4cb%E7%9A%84%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%BA%8E%E7%82%B9e%2C%E6%B1%82%E8%AF%81%EF%BC%9A%E5%9B%9B%E8%BE%B9%E5%BD%A2aecd%E6%98%AF%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2)
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