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21999 × 52001 [AHSME 1999] ( )
)
7( ) 5( ) 4( ) 2 ()
k = 20082 + 22008 [AMC10A 2008] (
k 2 + 2k
8( ) 6( ) 4( ) 2 ()
72 6A 6B [MAӨ 2007] ( )
16 ( ) A 12 ( ) 10 ( )
n [AMC10B 2007] ( )
14 ( )
94 94
.
9944 ( ) 4944 ( ) n
14414 ×14416 ×14418 4494( ) 4444( ) )
[MAӨ 2009] (
14
8( ) 7( ) 6( ) 5 ()
n [Aust.MC 2003] ( )
63 10n −1
9( ) 8( ) 6( ) 5 ()
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