如图,已知AD为△ABC的BC边上的中线,P为线段BD上一点,过点P作AD的平行线交AB于点Q,交CD的延长线于点R.求证PQ+PR=2AD.打错了,是交CA的延长线于点R。
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![如图,已知AD为△ABC的BC边上的中线,P为线段BD上一点,过点P作AD的平行线交AB于点Q,交CD的延长线于点R.求证PQ+PR=2AD.打错了,是交CA的延长线于点R。](/uploads/image/z/8893853-53-3.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%B7%B2%E7%9F%A5AD%E4%B8%BA%E2%96%B3ABC%E7%9A%84BC%E8%BE%B9%E4%B8%8A%E7%9A%84%E4%B8%AD%E7%BA%BF%2CP%E4%B8%BA%E7%BA%BF%E6%AE%B5BD%E4%B8%8A%E4%B8%80%E7%82%B9%2C%E8%BF%87%E7%82%B9P%E4%BD%9CAD%E7%9A%84%E5%B9%B3%E8%A1%8C%E7%BA%BF%E4%BA%A4AB%E4%BA%8E%E7%82%B9Q%2C%E4%BA%A4CD%E7%9A%84%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%BA%8E%E7%82%B9R.%E6%B1%82%E8%AF%81PQ%2BPR%3D2AD.%E6%89%93%E9%94%99%E4%BA%86%EF%BC%8C%E6%98%AF%E4%BA%A4CA%E7%9A%84%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%BA%8E%E7%82%B9R%E3%80%82)
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