如图,在△OAB中,|OC|=1/4 |OA,|OD|=1/2 |OB|,AD和BC相交于M,设(向量 ) OA=(向量 )a,(向量 )OB= (向量 )b.①如何用(向量 )a和(向量 )b表示 (向量 )OM?②在线段AC上取一点E,线段BD上取一点F,
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![如图,在△OAB中,|OC|=1/4 |OA,|OD|=1/2 |OB|,AD和BC相交于M,设(向量 ) OA=(向量 )a,(向量 )OB= (向量 )b.①如何用(向量 )a和(向量 )b表示 (向量 )OM?②在线段AC上取一点E,线段BD上取一点F,](/uploads/image/z/7376461-61-1.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E2%96%B3OAB%E4%B8%AD%2C%7COC%7C%3D1%2F4+%7COA%2C%7COD%7C%3D1%2F2+%7COB%7C%2CAD%E5%92%8CBC%E7%9B%B8%E4%BA%A4%E4%BA%8EM%2C%E8%AE%BE%EF%BC%88%E5%90%91%E9%87%8F+%EF%BC%89+OA%3D%EF%BC%88%E5%90%91%E9%87%8F+%EF%BC%89a%2C%EF%BC%88%E5%90%91%E9%87%8F+%EF%BC%89OB%3D+%EF%BC%88%E5%90%91%E9%87%8F+%EF%BC%89b.%E2%91%A0%E5%A6%82%E4%BD%95%E7%94%A8%EF%BC%88%E5%90%91%E9%87%8F+%EF%BC%89a%E5%92%8C%EF%BC%88%E5%90%91%E9%87%8F+%EF%BC%89b%E8%A1%A8%E7%A4%BA+%EF%BC%88%E5%90%91%E9%87%8F+%EF%BC%89OM%3F%E2%91%A1%E5%9C%A8%E7%BA%BF%E6%AE%B5AC%E4%B8%8A%E5%8F%96%E4%B8%80%E7%82%B9E%2C%E7%BA%BF%E6%AE%B5BD%E4%B8%8A%E5%8F%96%E4%B8%80%E7%82%B9F%2C)
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