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2x + 3y                                       yx              ()

      17        9x + 5y ( )                            17        )
                3x + 2y ( )                                      )
   900 ( )                                       2x + 5y ( )     )
 22538 ( )            n                          9x + y ( )      )
                                              [AIME 1986] (
     (9
      5( )                         n +10      n 3 +100

12A 3B              890 ( )        880 ( )        870 ( )

                            34256                             (

                  14638 ( )        24538 ( )  14538 ( )
                        (
                                   ) [AHSME 1981] (
                )
                      4( )         x = 121122111222111122223

                            A       3( )          2 ()

                                          [Mathcounts 1986] (

A =0 ( )          94               A =2(       A ≠B

             1  A =1 ( )                  ) A =3()
                                            [Mandelbrot 3] (
                                                                 )

11

2523 ( )        2522 ( )           2521 ( )   10

                                                 2520 ( )

                                                  ٢٦
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