Câu hỏi 6Nếu $x\gt y\gt0,$ thì $$ \frac{x^y y^x}{y^y x^x}= $$$(x-y)^{\frac{y}{x}}$$\left(\frac{x}{y}\right)^{x-y}$$1$$\left(\frac{x}{y}\right)^{y-x}$$(x-y)^{\frac{x}{y}}$