Аналитическая геометрия и линейная алгебра. Умнов А.Е. - 38 стр.

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                                                                            →
                                 a1 
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                                 a2 
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                                 a1 + a2 
                                
                                
                                                    →
                                                     e                                                                    l
                                
                                                               èqxytvr
                                

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