梯形ABCD,AB∥CD,且|向量AB|=2|向量CD|,M,N为DC和AB的中点,向量AB=a,向量AD=b,用a,b表示向量BC和向量MN,则向量BC=( );向量MN=( )
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![梯形ABCD,AB∥CD,且|向量AB|=2|向量CD|,M,N为DC和AB的中点,向量AB=a,向量AD=b,用a,b表示向量BC和向量MN,则向量BC=( );向量MN=( )](/uploads/image/z/2353729-49-9.jpg?t=%E6%A2%AF%E5%BD%A2ABCD%2CAB%E2%88%A5CD%2C%E4%B8%94%7C%E5%90%91%E9%87%8FAB%7C%3D2%7C%E5%90%91%E9%87%8FCD%7C%2CM%2CN%E4%B8%BADC%E5%92%8CAB%E7%9A%84%E4%B8%AD%E7%82%B9%2C%E5%90%91%E9%87%8FAB%3Da%2C%E5%90%91%E9%87%8FAD%3Db%2C%E7%94%A8a%2Cb%E8%A1%A8%E7%A4%BA%E5%90%91%E9%87%8FBC%E5%92%8C%E5%90%91%E9%87%8FMN%2C%E5%88%99%E5%90%91%E9%87%8FBC%3D%EF%BC%88+%EF%BC%89%EF%BC%9B%E5%90%91%E9%87%8FMN%3D%28+%29)
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