设向量a=(3,5,-4),b=(2,1,8),计算2a+3b,3a-2b,a*b以及a与b所成角的余弦值,并确定γ,μ应满足的条件,使γa+μb与z轴垂直
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![设向量a=(3,5,-4),b=(2,1,8),计算2a+3b,3a-2b,a*b以及a与b所成角的余弦值,并确定γ,μ应满足的条件,使γa+μb与z轴垂直](/uploads/image/z/2771924-68-4.jpg?t=%E8%AE%BE%E5%90%91%E9%87%8Fa%3D%EF%BC%883%2C5%2C-4%EF%BC%89%2Cb%3D%EF%BC%882%2C1%2C8%EF%BC%89%2C%E8%AE%A1%E7%AE%972a%2B3b%2C3a-2b%2Ca%2Ab%E4%BB%A5%E5%8F%8Aa%E4%B8%8Eb%E6%89%80%E6%88%90%E8%A7%92%E7%9A%84%E4%BD%99%E5%BC%A6%E5%80%BC%2C%E5%B9%B6%E7%A1%AE%E5%AE%9A%CE%B3%2C%CE%BC%E5%BA%94%E6%BB%A1%E8%B6%B3%E7%9A%84%E6%9D%A1%E4%BB%B6%2C%E4%BD%BF%CE%B3a%2B%CE%BCb%E4%B8%8Ez%E8%BD%B4%E5%9E%82%E7%9B%B4)
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