@ @RY@ @óïbÿa@‡ÉÜa@ú†bjà@ @ [AMC10B 2012] ( ) : . . ) .( ) ) .( .1× 3 × 3 × 3 × 3 × 3 × 3 = 729 [AMC10A 2011] ( 700 200 1,2, 5, 7, 8, 9 2 .( )5 2 4 .( ) 8 . .9 7 5 1 5 .1×4×1 = 4 82