Page 132 - Numbertheory

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. 2× 4× 2 = 16 1998 1998 = 2 × 33 ×37

18 ×111 : 6× 333 3× 666 . 16 = 8

9 × 222 2
2× 999 1×1998

. 27× 74 37 × 54

.( 1998 ≈ 45 )
. 54 − 37 = 17

50 [AHSME 1990] ( )

9( ) 7( ) 5( ) 3()

: 50 42 =16 :( )
.
62 = 36 52 = 25
32 = 9 22 = 4 12 = 1

. 7 72 = 49

34 × 45 × 56 6( ) [British IMC 2000] ( )
5( ) 4()
8( )

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