Câu 9: Thực hiện phép tính:
a) \(\dfrac{3x-2}{2xy}+\dfrac{7x+2}{2xy}\).
b) \(\dfrac{5x+y^2}{x^2y}+\dfrac{x^2-5y}{xy^2}\).
c) \(\dfrac{3x-2}{2xy}-\dfrac{7x-y}{2xy}\).
d) \(\dfrac{5x+y^2}{x^2y}-\dfrac{5y-x^2}{xy^2}\).
e) \(\dfrac{16xy}{3x-1}.\dfrac{3-9x}{12xy^3}\).
f) \(\dfrac{8xy}{3x-1}:\dfrac{12xy^3}{5-15x}\).