Аналитическая геометрия и линейная алгебра. Умнов А.Е. - 75 стр.

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→        →            →
 r = r0 + τ a 
                  
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                                     (n1 , n1 )          (n1 , n2 )                                    d1         (n1 , n2 )                                      (n1 , n1 )          d1
                   ∆ = det              →       →           →      →          ∆ ξ = det                          →      →         Ò ∆ η = det                  →      →                   
                                     (n2 , n1 ) (n2 , n2 )                                             d2        (n2 , n2 )                                      (n2 , n1 ) d 2
         
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