Аналитическая геометрия и линейная алгебра. Умнов А.Е. - 46 стр.

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                                                                                                 e1     e2     e3 
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                = det          e1 − det 1     e2 + det 1      e = det ξ1 ξ 2                                   ξ3 .
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