Đề kiểm tra 1 tiết toán đại 8

 Câu 1:  ( 3 điểm ) Thực hiện phép tính :

              a ) x2.( 3x2­­ - 5x + 1 )

              b ) x .( 3x - 5 ) + ( x+1 )( x - 6 ) - ( 2x - 3 )2

              c ) ( 5x4 - 3x3 + x2 ) : 3x2

 Câu 2 :  ( 3 điểm ) Cho đa thức : A = x2 + 2x + 1 - y2

              a ) Phân tích đa thức A thành nhân tử

              b ) Tính A tại x = 103 ; y= - 4

 Câu 3 :   ( 3 điểm ) Cho đa thức : B = x .( x -5 ) + x - 5

               a ) Phân tích đa thức B thành nhân tử

               b ) Tìm x biết B = 0

 Câu 4 : ( 1 điểm ) Tìm a sao cho đa thức ( x4 - x3 + 6x2 - x + a ) chia hết cho đa thức

                                 ( x2 - x +5 )

                                                   BÀI LÀM :

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