已知ABC三点的坐标分别为(-1,0),(3,-1),(1,2).且向量AE=1/3向量AC,向...已知ABC三点的坐标分别为(-1,0),(3,-1),(1,2).且向量AE=1/3向量AC,向量BF=1/3向量BC.求证向量EF平行向量AB
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![已知ABC三点的坐标分别为(-1,0),(3,-1),(1,2).且向量AE=1/3向量AC,向...已知ABC三点的坐标分别为(-1,0),(3,-1),(1,2).且向量AE=1/3向量AC,向量BF=1/3向量BC.求证向量EF平行向量AB](/uploads/image/z/5209157-29-7.jpg?t=%E5%B7%B2%E7%9F%A5ABC%E4%B8%89%E7%82%B9%E7%9A%84%E5%9D%90%E6%A0%87%E5%88%86%E5%88%AB%E4%B8%BA%28-1%2C0%29%2C%283%2C-1%29%2C%281%2C2%29.%E4%B8%94%E5%90%91%E9%87%8FAE%3D1%2F3%E5%90%91%E9%87%8FAC%2C%E5%90%91...%E5%B7%B2%E7%9F%A5ABC%E4%B8%89%E7%82%B9%E7%9A%84%E5%9D%90%E6%A0%87%E5%88%86%E5%88%AB%E4%B8%BA%28-1%2C0%29%2C%283%2C-1%29%2C%281%2C2%29.%E4%B8%94%E5%90%91%E9%87%8FAE%3D1%2F3%E5%90%91%E9%87%8FAC%2C%E5%90%91%E9%87%8FBF%3D1%2F3%E5%90%91%E9%87%8FBC.%E6%B1%82%E8%AF%81%E5%90%91%E9%87%8FEF%E5%B9%B3%E8%A1%8C%E5%90%91%E9%87%8FAB)
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