四边形EFGH是平行四边形平行四边形ABCD的对角线AC,BD相交与点O,且点EFGH分别是AO,BO,CO,DO的中点.
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![四边形EFGH是平行四边形平行四边形ABCD的对角线AC,BD相交与点O,且点EFGH分别是AO,BO,CO,DO的中点.](/uploads/image/z/8671423-31-3.jpg?t=%E5%9B%9B%E8%BE%B9%E5%BD%A2EFGH%E6%98%AF%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%E7%9A%84%E5%AF%B9%E8%A7%92%E7%BA%BFAC%2CBD%E7%9B%B8%E4%BA%A4%E4%B8%8E%E7%82%B9O%2C%E4%B8%94%E7%82%B9EFGH%E5%88%86%E5%88%AB%E6%98%AFAO%2CBO%2CCO%2CDO%E7%9A%84%E4%B8%AD%E7%82%B9.)
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