Bài 1.         Điền vào ch trống cho thích hợp:

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Bài 1. Làm tính nhân

a.

 

b.(2x2 -3x)(5x2 -2x + 1)

 

c.(2x-3y)(2x+3y)

 

Bài 2: Rút gọn

a)     (x + 3)(x – 3) – (x – 2)(x + 5)  

b)     (x4 – 2x3 + 2x – 1) : ( x2 – 1)

c)     a) (4x – 3)(x – 5) – 2x(2x – 11)

d)     (8x3 – 6x2 - 5x + 3) : (4x + 3)

e)     (2x + 3)2 + (2x + 5)2 – 2(2x + 3)(2x + 5)

f)      (x2 – 3x + xy – 3y) : (x + y)

 

Bài 3: Phân tích các đa thức sau thành nhân tử:

x – xy + y – y2             

2xy + 3z + 6y + xz        

x2 – 4x – y2 + 4

x2 – 3x + xy – 3y

5x2y2 + 15x2y + 30xy2                              

x2 – 2xy + y2xy + yz

10x2y – 15xy2 + 25x2y2

x- 10x + 25  

2xy – x2 –y2 + 16

x- 64         

Bài 4 : Tìm x

  1. (3x + 4)(4 – x) = 0
  2. 3x(x – 4) – 2(x – 4) = 0
  3. 7x2 – 28 = 0

 

 

 

nguon VI OLET