Аналитическая геометрия и линейная алгебра. Умнов А.Е. - 223 стр.

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                            ÒºÓÈã­‚ˈÒäˈ mÒ
                            
                                                          1 ( x ) = ξ12 + 3ξ 22 − 4ξ1ξ 2 + 2ξ1ξ 3 − 2ξ 2ξ 3 
                            

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