Аналитическая геометрия и линейная алгебра. Умнов А.Е. - 322 стр.

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                             λ z = λ (α + βi ) = ( λ α ) + ( λ β )i ;                                                       


                             z1 z 2 = (α1 + β1i )(α 2 + β2 i ) = (α1α 2 − β1 β2 ) + (α1 β2 + α 2 β1 )i                  .
       
       
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     z1 z 2 = (α1 + β1i )(α 2 + β 2i ) = α1α 2 + α1β i + α 2 β1i + β1β 2i 2 = (α1α 2 − β1β 2 ) + (α1β 2 + α 2 β1 )i 
       
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