如下图,AC交BD于点O,请你从下项中选出两个作为条件,另一个为结论,写出一命题,并加以证明.①OA=OC,②OB=OD,③AB‖DC.
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![如下图,AC交BD于点O,请你从下项中选出两个作为条件,另一个为结论,写出一命题,并加以证明.①OA=OC,②OB=OD,③AB‖DC.](/uploads/image/z/9924660-36-0.jpg?t=%E5%A6%82%E4%B8%8B%E5%9B%BE%2CAC%E4%BA%A4BD%E4%BA%8E%E7%82%B9O%2C%E8%AF%B7%E4%BD%A0%E4%BB%8E%E4%B8%8B%E9%A1%B9%E4%B8%AD%E9%80%89%E5%87%BA%E4%B8%A4%E4%B8%AA%E4%BD%9C%E4%B8%BA%E6%9D%A1%E4%BB%B6%2C%E5%8F%A6%E4%B8%80%E4%B8%AA%E4%B8%BA%E7%BB%93%E8%AE%BA%2C%E5%86%99%E5%87%BA%E4%B8%80%E5%91%BD%E9%A2%98%2C%E5%B9%B6%E5%8A%A0%E4%BB%A5%E8%AF%81%E6%98%8E.%E2%91%A0OA%3DOC%2C%E2%91%A1OB%3DOD%2C%E2%91%A2AB%E2%80%96DC.)
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