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@ @WQ@                     @†a‡Èÿa@                        @

10 ( )          8( )            6( )               4 ()
                                            [AMC82001] ( )
23 ( )                         63
  .( 5
                           .

              19 ( )           18 ( )             17 ( )
                                            [AMC82001] ( )
            1, 2, 3, 4, 9

            )

9 ( ) 3 ( ) 2 ( ) 1 ()

 :      (6 ⊗ 4) ⊗ 3    a ⊗b = a +b       )  [AMC82001] (   )
30 ( )                             a −b                    )
                15 (                               4 ()
                      ) 13 (                [AMC82002] (

                         .

            ()                     ()       706
                               57 ( )
59 ( )         58 ( )                                 ()   )
         .                                    ()           )
            120                             [AMC82003] (

                    .                              55 ( )
                                            [AMC82003] (

                           90
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