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                                                                                       !        !     "#"" "#"" KIỂM TRA BÀI CŨ:   $%& '  () *  (  + &&%& * , -.&/$*0&/$1$&234&/ 5     66      Tit 11:   !" #$%&  / ,    66 '()*+,-'.*/0-*1.203-*4,*,*+, -5 x 2 y 2 4x 4 - + + = (x 2 +4x+4) – y 2 = (x+2) 2 - y 2 =(x+2+y)(x+2 –y) x 2 /7 $89:;9<  6  ##9=89> Ví dụ 2 Tit 11:   !" #$%&  x 2 -3x+ xy - 3y =(x 2 +xy ) + (-3x -3y) =x( x+y) - 3( x+y) =(x+y)(x - 3) Ph©n tÝch ®a thøc thµnh nh©n tö. *VÝ dô 1 x 2 -y 2 + 4x +4 =(x 2 +4x+4 ) - y 2 = ( x+2) 2 - y 2 =(x+2+y)(x+2 -y) *VÝ dô 2 Nhãm c¸c h¹ng tö thÝch hîp ®Ó xuÊt hiÖn nh©n tö chung Nhãm c¸c h¹ng tö thÝch hîp ®Ó xuÊt hiÖn h»ng ®¼ng thøc Tit 11:   !" #$%&  1$?@&/:                       !" # $ % !"  & -     A + BC  #     D    E -   + A + BC  #     D #   ED  E   DEDE DED  E -  A + BC  #     D #   ED  E   D  ED  E D  ED  EDED  E  F 6G6  HG   , IBJG + AK +  ,  ,      Tit 11:   !" #$%&  )LL -     A + BC  #      D    E MD    ) + (EN M  DEDEN DED  E -   + A + BC  #      D #   ED  E   DEDE DED  E DED  E -  A + BC  #     D #   ED  E   D  ED  E D  ED  EDED  E #  Phân tích đa thức sau thành nhân tử:   6 787   6   9669   966   9  99   6       9  Tit 11:   !" #$%&  CK  8 F   9C    K , = - OIBA     + 98  ;P , ;G , Q  BA     CK  9C  G   - R + B   + 98  #S#STUV/WX RC6  - + #9C  G  9IG +     - YA    CK  89!  ; 9C  9 + 89>;P   - OIBA     + 98  ;P , ;G , Q  BA     CK  9C  G   - R + B   + 98  #S#STUV/WX RC6  - + #9C  G  9IG +     - YA    CK  89!  ; 9C  9 + 89>;P   .     CK  9C  G   - R + B   + 98  #S#S TU V/WX RC6  - + #9C  G  9IG +   .     CK  9C  G   - R + B   + 98  #S#S TU V/WX RC6  - + #9C  G  9IG +   