已知平面上三个向量a,b,c的模均为1,它们相互之间的夹角为120度.第一:求证(a-b)垂直于c.第二:...已知平面上三个向量a,b,c的模均为1,它们相互之间的夹角为120度.第一:求证(a-b)垂直于
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![已知平面上三个向量a,b,c的模均为1,它们相互之间的夹角为120度.第一:求证(a-b)垂直于c.第二:...已知平面上三个向量a,b,c的模均为1,它们相互之间的夹角为120度.第一:求证(a-b)垂直于](/uploads/image/z/4035049-25-9.jpg?t=%E5%B7%B2%E7%9F%A5%E5%B9%B3%E9%9D%A2%E4%B8%8A%E4%B8%89%E4%B8%AA%E5%90%91%E9%87%8Fa%2Cb%2Cc%E7%9A%84%E6%A8%A1%E5%9D%87%E4%B8%BA1%2C%E5%AE%83%E4%BB%AC%E7%9B%B8%E4%BA%92%E4%B9%8B%E9%97%B4%E7%9A%84%E5%A4%B9%E8%A7%92%E4%B8%BA120%E5%BA%A6.%E7%AC%AC%E4%B8%80%EF%BC%9A%E6%B1%82%E8%AF%81%EF%BC%88a%EF%BC%8Db%EF%BC%89%E5%9E%82%E7%9B%B4%E4%BA%8Ec.%E7%AC%AC%E4%BA%8C%EF%BC%9A...%E5%B7%B2%E7%9F%A5%E5%B9%B3%E9%9D%A2%E4%B8%8A%E4%B8%89%E4%B8%AA%E5%90%91%E9%87%8Fa%2Cb%2Cc%E7%9A%84%E6%A8%A1%E5%9D%87%E4%B8%BA1%2C%E5%AE%83%E4%BB%AC%E7%9B%B8%E4%BA%92%E4%B9%8B%E9%97%B4%E7%9A%84%E5%A4%B9%E8%A7%92%E4%B8%BA120%E5%BA%A6.%E7%AC%AC%E4%B8%80%EF%BC%9A%E6%B1%82%E8%AF%81%EF%BC%88a%EF%BC%8Db%EF%BC%89%E5%9E%82%E7%9B%B4%E4%BA%8E)
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