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2                                  .15
                                                             .BD     :√2

                                                   BD = √2                .16
                          2 2 = √2 2 AC /∙ 2
                         4 2 = √2 AC /: √2

                                  √=

   2 -1. -                   1    +1                                    .17
                 =(      )(-2 -1      2 −1
                                                                     2
                                  )(
                                                                  )

   .( <              <)           21
   = −1                                            .

           2

5
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