若向量a、b、c 两两所成的角相等,而且 |a| = 1,| b | = 1,| c | =3,则| a+b+c| 等于( )我会追分的!
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![若向量a、b、c 两两所成的角相等,而且 |a| = 1,| b | = 1,| c | =3,则| a+b+c| 等于( )我会追分的!](/uploads/image/z/1073361-57-1.jpg?t=%E8%8B%A5%E5%90%91%E9%87%8Fa%E3%80%81b%E3%80%81c+%E4%B8%A4%E4%B8%A4%E6%89%80%E6%88%90%E7%9A%84%E8%A7%92%E7%9B%B8%E7%AD%89%2C%E8%80%8C%E4%B8%94+%7Ca%7C+%3D+1%2C%7C+b+%7C+%3D+1%2C%7C+c+%7C+%3D3%2C%E5%88%99%7C+a%2Bb%2Bc%7C+%E7%AD%89%E4%BA%8E%EF%BC%88+%EF%BC%89%E6%88%91%E4%BC%9A%E8%BF%BD%E5%88%86%E7%9A%84%21)
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