在平行四边形ABCD,AD=a,AD=b,M为AB的中点,点N在DB上,且DN=tNB,当t=2时,证明M,...在平行四边形ABCD,AD=a,AD=b,M为AB的中点,点N在DB上,且DN=tNB,当t=2时,证明M,N,C三点共线 PS:AD,a,AB,b,DN,NB都是向量
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![在平行四边形ABCD,AD=a,AD=b,M为AB的中点,点N在DB上,且DN=tNB,当t=2时,证明M,...在平行四边形ABCD,AD=a,AD=b,M为AB的中点,点N在DB上,且DN=tNB,当t=2时,证明M,N,C三点共线 PS:AD,a,AB,b,DN,NB都是向量](/uploads/image/z/11633940-36-0.jpg?t=%E5%9C%A8%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%2CAD%3Da%2CAD%3Db%2CM%E4%B8%BAAB%E7%9A%84%E4%B8%AD%E7%82%B9%2C%E7%82%B9N%E5%9C%A8DB%E4%B8%8A%2C%E4%B8%94DN%3DtNB%2C%E5%BD%93t%3D2%E6%97%B6%2C%E8%AF%81%E6%98%8EM%2C...%E5%9C%A8%E5%B9%B3%E8%A1%8C%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%2CAD%3Da%2CAD%3Db%2CM%E4%B8%BAAB%E7%9A%84%E4%B8%AD%E7%82%B9%2C%E7%82%B9N%E5%9C%A8DB%E4%B8%8A%2C%E4%B8%94DN%3DtNB%2C%E5%BD%93t%3D2%E6%97%B6%2C%E8%AF%81%E6%98%8EM%2CN%2CC%E4%B8%89%E7%82%B9%E5%85%B1%E7%BA%BF+PS%3AAD%2Ca%2CAB%2Cb%2CDN%2CNB%E9%83%BD%E6%98%AF%E5%90%91%E9%87%8F)
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