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x [AHSME 1966] ( )

2x 2 − 10x = x − 3
x 2 − 5x

3() 2( ) 1( ) 0 ()

1−x 1 x [MAΘ 1992] ( )

−1 ( ) 2( ) 1( ) 1−x

7 0 () )
[MAΘ 1990] (

19 ( ) 17 ( ) 15 ( ) 13 ( )

ba [AHSME 1960] ( )
)
: 3x − 5 + a = bx + 1 )
)
b =/ 3 ( ) b =/ 0 ( ) a =/ 6 ( ) a =/ 2b ( )

: 2x2 − 13x = 7 (

−15 ( ) 15 ( ) −13 ( ) 13 ( )

2 2 2 2

2 1() −2 1 ( ) 2 3x + 2 = −7 (
x
3 3
a − 1 ( ) −2 − 1 ( )
−16 ( )
. 33
−8 ( )
[AMC12A 2005] (

4x2 + ax + 8x + 9 = 0

20 ( ) 8 ()