已知空间中三点A(-2,0,2)B(-1,1,2)C(-3,0,4),设a=向量AB,b=向量AC(1)若|c|=3,且c平行于向量BC,求向量c(2)求向量a与向量b的夹角的余弦值(3)若ka+b与ka-2b互相垂直,求实数k的值
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![已知空间中三点A(-2,0,2)B(-1,1,2)C(-3,0,4),设a=向量AB,b=向量AC(1)若|c|=3,且c平行于向量BC,求向量c(2)求向量a与向量b的夹角的余弦值(3)若ka+b与ka-2b互相垂直,求实数k的值](/uploads/image/z/1580769-9-9.jpg?t=%E5%B7%B2%E7%9F%A5%E7%A9%BA%E9%97%B4%E4%B8%AD%E4%B8%89%E7%82%B9A%28-2%2C0%2C2%29B%28-1%2C1%2C2%29C%28-3%2C0%2C4%29%2C%E8%AE%BEa%3D%E5%90%91%E9%87%8FAB%2Cb%3D%E5%90%91%E9%87%8FAC%281%29%E8%8B%A5%7Cc%7C%3D3%2C%E4%B8%94c%E5%B9%B3%E8%A1%8C%E4%BA%8E%E5%90%91%E9%87%8FBC%2C%E6%B1%82%E5%90%91%E9%87%8Fc%EF%BC%882%EF%BC%89%E6%B1%82%E5%90%91%E9%87%8Fa%E4%B8%8E%E5%90%91%E9%87%8Fb%E7%9A%84%E5%A4%B9%E8%A7%92%E7%9A%84%E4%BD%99%E5%BC%A6%E5%80%BC%EF%BC%883%EF%BC%89%E8%8B%A5ka%2Bb%E4%B8%8Eka-2b%E4%BA%92%E7%9B%B8%E5%9E%82%E7%9B%B4%2C%E6%B1%82%E5%AE%9E%E6%95%B0k%E7%9A%84%E5%80%BC)
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