已知 如图AB平行于CD AD交BC于点O EF过点O 分别交AB CD于点E F 且AE=DF 求证O是EF的中点(过程完整,后面要写原因.THANK YOU...)
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![已知 如图AB平行于CD AD交BC于点O EF过点O 分别交AB CD于点E F 且AE=DF 求证O是EF的中点(过程完整,后面要写原因.THANK YOU...)](/uploads/image/z/2786944-40-4.jpg?t=%E5%B7%B2%E7%9F%A5+%E5%A6%82%E5%9B%BEAB%E5%B9%B3%E8%A1%8C%E4%BA%8ECD+AD%E4%BA%A4BC%E4%BA%8E%E7%82%B9O+EF%E8%BF%87%E7%82%B9O+%E5%88%86%E5%88%AB%E4%BA%A4AB+CD%E4%BA%8E%E7%82%B9E+F+%E4%B8%94AE%3DDF+%E6%B1%82%E8%AF%81O%E6%98%AFEF%E7%9A%84%E4%B8%AD%E7%82%B9%28%E8%BF%87%E7%A8%8B%E5%AE%8C%E6%95%B4%2C%E5%90%8E%E9%9D%A2%E8%A6%81%E5%86%99%E5%8E%9F%E5%9B%A0.THANK+YOU...%29)
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