Thực hiện phép tính $\frac{(3-x)^{3}}{3x^{2}}×\frac{6x}{x^{2}-6x+9}$

`((3-x)³)/(3x²)× 6x/(x²-6x+9)`

`=((3-x)³)/(x)× 2/(x²-6x+9) `

`= ((3-x)³)/(x)× 2/((x-3)²)`

`= ((3-x)³)/(x)× 2/((3-x)²)`

`= (3-x)/x × 2 `

`= (2(3-x))/x`

`= (6 – 2x )/x`