Page 108 - Numbertheory

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3!× 5! × 7! 5( ) [MAC10A 2005] ( )
4( ) 3()
6( ) a2 +b2 = c2
[MAӨ 2005] ( )
cba

36 ( ) 29 ( ) (c + b ) (c −b )

50 n 21 ( ) 17 ( ) )
(

15 ( ) 13 ( ) 4 7 ()
()
80 n 9( )

9

9( ) 3( ) 2( ) 1 ()

p+2 p ()

40 19 .

899 ( ) 713 ( ) 621 ( ) 437 ( )

27 n ()

2n +1

6( ) 5( ) 4( ) 3 ()
()
A −B BA [AMC10B 2002] ( )

: . A+B

3 ()

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