在四边形ABCD中,对角线AC、BD相交于点O,直线MN经过点O,设锐角∠DOC=∠α,将△DOC以直线MN为对称轴翻折得到△D´OC´(D与D´对应,C与C´对应),直线AD´、BC´相交于点P.当四边形AB
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![在四边形ABCD中,对角线AC、BD相交于点O,直线MN经过点O,设锐角∠DOC=∠α,将△DOC以直线MN为对称轴翻折得到△D´OC´(D与D´对应,C与C´对应),直线AD´、BC´相交于点P.当四边形AB](/uploads/image/z/11791964-20-4.jpg?t=%E5%9C%A8%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%E4%B8%AD%2C%E5%AF%B9%E8%A7%92%E7%BA%BFAC%E3%80%81BD%E7%9B%B8%E4%BA%A4%E4%BA%8E%E7%82%B9O%2C%E7%9B%B4%E7%BA%BFMN%E7%BB%8F%E8%BF%87%E7%82%B9O%2C%E8%AE%BE%E9%94%90%E8%A7%92%E2%88%A0DOC%EF%BC%9D%E2%88%A0%CE%B1%2C%E5%B0%86%E2%96%B3DOC%E4%BB%A5%E7%9B%B4%E7%BA%BFMN%E4%B8%BA%E5%AF%B9%E7%A7%B0%E8%BD%B4%E7%BF%BB%E6%8A%98%E5%BE%97%E5%88%B0%E2%96%B3D%26%23180%3BOC%26%23180%3B%EF%BC%88D%E4%B8%8ED%26%23180%3B%E5%AF%B9%E5%BA%94%2CC%E4%B8%8EC%26%23180%3B%E5%AF%B9%E5%BA%94%EF%BC%89%2C%E7%9B%B4%E7%BA%BFAD%26%23180%3B%E3%80%81BC%26%23180%3B%E7%9B%B8%E4%BA%A4%E4%BA%8E%E7%82%B9P.%E5%BD%93%E5%9B%9B%E8%BE%B9%E5%BD%A2AB)
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