在平行四边形ABCD中,EF为对角线BD上两点,并且BE=DF,则四边形AECF为平行四边形,请说明理由.八年级练考通上面的,北师大版的 期末测试卷.
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![在平行四边形ABCD中,EF为对角线BD上两点,并且BE=DF,则四边形AECF为平行四边形,请说明理由.八年级练考通上面的,北师大版的 期末测试卷.](/uploads/image/z/2124153-9-3.jpg?t=%E5%9C%A8%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%E4%B8%AD%2CEF%E4%B8%BA%E5%AF%B9%E8%A7%92%E7%BA%BFBD%E4%B8%8A%E4%B8%A4%E7%82%B9%2C%E5%B9%B6%E4%B8%94BE%3DDF%2C%E5%88%99%E5%9B%9B%E8%BE%B9%E5%BD%A2AECF%E4%B8%BA%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2%2C%E8%AF%B7%E8%AF%B4%E6%98%8E%E7%90%86%E7%94%B1.%E5%85%AB%E5%B9%B4%E7%BA%A7%E7%BB%83%E8%80%83%E9%80%9A%E4%B8%8A%E9%9D%A2%E7%9A%84%2C%E5%8C%97%E5%B8%88%E5%A4%A7%E7%89%88%E7%9A%84++%E6%9C%9F%E6%9C%AB%E6%B5%8B%E8%AF%95%E5%8D%B7.)
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