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(2009•莱芜)如图,在四边形ABCD中,已知AB与CD不平行,∠ABD=∠A...
(2009•莱芜)如图,在四边形ABCD中,已知AB与CD不平行,∠ABD=∠ACD,请你添加一个条件:
,使得加上这个条件后能够推出AD∥BC且AB=CD.
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