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![四边形ABCD中,AB=DC,AC=DB,过点A作AE||DC交cb延长线于E.﹙1﹚三角形ABC全等于三角形DCB﹙2﹚四边形AECD为平行四边形](/uploads/image/z/902717-53-7.jpg?t=%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%E4%B8%AD%2CAB%3DDC%2CAC%3DDB%2C%E8%BF%87%E7%82%B9A%E4%BD%9CAE%7C%7CDC%E4%BA%A4cb%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%BA%8EE.%EF%B9%991%EF%B9%9A%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E5%85%A8%E7%AD%89%E4%BA%8E%E4%B8%89%E8%A7%92%E5%BD%A2DCB%EF%B9%992%EF%B9%9A%E5%9B%9B%E8%BE%B9%E5%BD%A2AECD%E4%B8%BA%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2)
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