急

1.因式分解 4c^2-6dx+3cd-8cx
  4c^2-6dx+3cd-8cx
=4c^2-8cx-6dx+3cd
=4c(c-2x)-3d(2x-c)
=4c(c-2x)+3d(c-2x)
=(4c+3d)(c-2x)

2.因式分解4x^3-3y+4x-3x^2 y
  4x^3-3y+4x-3x^2 y
=4x^3-(3x^2)(y)-4x-3y
=x^2(4x-3y)+(4x-3y)
=(x^2+1)(4x-3y)

3.(a+1)(a^2-a+1)  
  (a+1)(a^2-a+1)
=a^3+b^3

4.(x-2)(x^2+2x+4)
  (x-2)(x^2+2x+4)
=x^3-8

5.佢應該係比左d意思你,叫你係篇文度搵果個字出黎