thực hiện các phep tính sau:

      a)3x³y² : x²                                                          b) (x⁵ + 4x³ – 6x²) : 4x²

      c)10x³y – 5x²y² – 25x⁴y³) : (-5xy)                    d) (27x³ – y³) : (3x – y)

tìm x biết:

       a)x² + 3x = 0                                             b) x³ – 4x = 0                                                      

  c) 5x(x-1) = x-1                                      d) 2(x+5) - x²-5x = 0  

e) 2x(x-5)-x(3+2x)=26                               f)   5x.(x – 2012) – x + 2012 = 0 

a) x² - y² - 2x + 2y                                           b)2x + 2y - x² - xy   

      c) 3x² + 5x - 3xy- 5y                                       d) x² - 25 + y² + 2xy           

      e) x³ - 11 x² + 30x                                           f)   x² + 3x - 18  

phân tích các đa thức thành nhân tử

 a) x²(x – 2x³)                                                            b) (x² + 1)(5 – x)

c) (2x – 1)(3x + 2)(3 – x)                                           d) (x – 2)(x – x² + 4)           

e) ( x² – 2xy + y²).(x – y)                         f) (x² – 1)(x² + 2x)