求湘教版八年级下册A组4、5、6、8、9、10、11,B组1、2的答案!A组:4、已知:平行四边形ABCD的对角线相交于点O,EF经过点O,分别于边AB,DC相交于点E,F,点M,N分别是线段OA,OC的中点.求证:四边形ENFM是

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