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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 ( )
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