Page 82 - aljaber

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(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] ( )

() .