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QXY@ @†ì‡¨a@pa rØ

                                                 a −b +c +d −e + f

5 ( ) 3 ( ) 2 ( ) 0 ()

6x 4 − 3x 3 − 4x2 + x = (x − a)(x − b)(x − c)(x − d)                   ()

                                        a +b +c +d

3 33 ( )       2( )                 1( )                 1()
7 ()                              3( )
          x 4 − 10x 2 + 9                                 2

            6( )                                               ()
                                                         0 ()

         x 2 + 4x + 1   x 4 + x 3 − 7x 2 + 13x + 4                  (  )

x 2 + 3x + 4 ( )                          x 2 − 3x + 4 ( )

x 2 − 3x − 4 ( )                        x 2 + 3x − 4 ( )

( )x 4 − 3x 3 − x + 3 = x2 + x + a (x + b)(x + c)                   ()

3() 1( )                   −1 ( )                           abc

( )x 6 − x 4 − x 2 + 1 = ax 2 + bx + c (x + 1)2(x − 1)2  −3 ( )        )
                                                               (

                                                         abc

3()               2( )            1( )                   0 ()
3()
                  x −1  x 13 + 1          [AHSME 1950] (               )
                                                                       )
                  2( )            1( )                   0 ()

                  x +2     m [MAΘ 1991] (

                           f (x ) = x 3 + 3m2x 2 + mx + 4
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