1.在平行四边形ABCD中,AC与BD相交于O,E是OD中点AE的延长线与CD相交于点F,若向量AC=a,向量BD=b,则AF=?2.已知C为线段AB上一点,P为直线AB外一点,满足│向量PA│-│向量PB│=2,│向量PA-向量PB│=2倍根
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![1.在平行四边形ABCD中,AC与BD相交于O,E是OD中点AE的延长线与CD相交于点F,若向量AC=a,向量BD=b,则AF=?2.已知C为线段AB上一点,P为直线AB外一点,满足│向量PA│-│向量PB│=2,│向量PA-向量PB│=2倍根](/uploads/image/z/14220793-1-3.jpg?t=1.%E5%9C%A8%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%E4%B8%AD%2CAC%E4%B8%8EBD%E7%9B%B8%E4%BA%A4%E4%BA%8EO%2CE%E6%98%AFOD%E4%B8%AD%E7%82%B9AE%E7%9A%84%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%B8%8ECD%E7%9B%B8%E4%BA%A4%E4%BA%8E%E7%82%B9F%2C%E8%8B%A5%E5%90%91%E9%87%8FAC%EF%BC%9Da%2C%E5%90%91%E9%87%8FBD%EF%BC%9Db%2C%E5%88%99AF%EF%BC%9D%3F2.%E5%B7%B2%E7%9F%A5C%E4%B8%BA%E7%BA%BF%E6%AE%B5AB%E4%B8%8A%E4%B8%80%E7%82%B9%2CP%E4%B8%BA%E7%9B%B4%E7%BA%BFAB%E5%A4%96%E4%B8%80%E7%82%B9%2C%E6%BB%A1%E8%B6%B3%E2%94%82%E5%90%91%E9%87%8FPA%E2%94%82-%E2%94%82%E5%90%91%E9%87%8FPB%E2%94%82%3D2%2C%E2%94%82%E5%90%91%E9%87%8FPA-%E5%90%91%E9%87%8FPB%E2%94%82%3D2%E5%80%8D%E6%A0%B9)
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