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4 ( ) 2 ( ) 1 ( ) 0 ()
.1 [AJHSME 1996] ( )
1−x
x
2 .1
. 1 = 1 = −1 1−x
1 − 2 −1
5
1.25 ( ) 0.8 ( ) 0( ) 1
:
1−x )
. 50
. −0.25 ( )
.
[AJHSME 1997] (
•
•
N
:N
48 ( ) 36 ( ) 25 ( ) 7 ()
98 2 [AJHSME 1997] ( )
0
6 ( ) 4 ( ) 2 ( ) 0 ()
x =7 [AJHSME 1998] ( )
x () 6 () 6 () 6 ()
6 x −1 x +1 x
