4x^2y·(-xy^2)/x^2y^4得多少?最好有過程,謝謝了~~ (3x+2)(x-3)-3(x-2)^2得多少?

4x^2y·(-xy^2)/x^2y^4得多少?最好有過程,謝謝了~~ (3x+2)(x-3)-3(x-2)^2得多少?

4x²;y*(-xy²;)/x²;y⁴;
=-4x³;y³;/x²;y⁴;
=-4x/y