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4 .
.
83 ( ) 63 ( ) 43 ( ) 23 ()
4 4 4 4
c [AHSME 1988] ( )
(x + 2)(x + b) = x 2 + cx + 6
−3 ( ) 5( ) −2 ( ) 3 ()
. 120
16 ( )
6
4
192
.
26 ( ) 24 ( ) 22 ( ) 20 ( )
n≠0 m≠0 [AHSME 1968 , AMC12B 2002] ( )
)
: x 2 + mx + n = 0
1() 1( ) −1 ( ) −1 ()
2 BA 2
15
(
.x
A
B4
.
