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@ @VY@ @†a‡Èÿa@ @
(1998 )2 ( ) (199.8)2 ( ) (19.98)2 ( ) (1.998)2 ( )
[AJHSME 1998] (
W,Z,Y, X )
.{1,2, 3, 4}
W +Y W −Y = 1
XZ
7 ( ) 5 ( ) 4 ( ) 3 ()
[AJHSME 1998] ( )
)
2 1 − 1 + 3 1 − 1 + 4 1 − 1 + + 10 1 − 1
2 3 4 10
55 ( ) 50 ( ) 49 ( ) 45 ( )
[AMC8 1999] (
1
(2,−2,1) ( ) 1 , 1 , 1 ( )
(1.1,−2.1,1.0) ( ) 2 3 6
1, 4, 7,10,13 (0.1, 0.3, 0.6) ( )
[AMC8 1999] ( )
() .