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A = 6 A + B = 12 B = 6
A = 10 . A = 10 A = 1 .B =2 .A ≠B
.A =1
1 [Mandelbrot 3] ( )
1
1
2523 ( ) 2522 ( ) 2521 ( ) 10
2520 ( )
.n :( )
.9 8 7 6 5 4 3 2
n −1
3 9
.4 2 8
. 2×3= 6 32
75 n −1 .9 8
.5×7×8×9 . n = 2521 n −1 = 2520
4n [Mathcounts 1984] ( )
5 73 5 2
140 ( ) 138 ( ) 130 ( ) 128 ( )
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