Аналитическая геометрия и линейная алгебра. Умнов А.Е. - 157 стр.

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                                    ξ1   + ξ2     =          − ξ3      − ξ4        − ξ5
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                                           ξ2     =          − 2ξ 3    − 2ξ 4      − 6ξ 5
     

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