帮忙做2道因式分解题，谢谢，急用！悬赏100分，做好的追加100分~

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

6xy-x^2y^2-9
=-[(xy)^2-6xy+9]
=-(xy-3)^2

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

6xy-x^2y^2-9
=-(x^2y^2-6xy+9)
=(xy-3)^2

原式=2（x-y)(x^3-4x)=2x(x-y)(x^2-4）=2x（x-y)(x-2)(x+2）
原式=-【（xy)^2-6xy+9】=-（xy-3)^2

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

6xy-x^2y^2-9
=-[(xy)^2-6xy+9]
=-(xy-3)^2
不知道对不对