Simplify the expression $\frac{\sqrt{x}}{\sqrt{y}}$√x√y to a single surd.

Simplify the expression $\frac{\sqrt[3]{m}}{\sqrt[3]{n}}$^{3}√m^{3}√n to a single surd.

Simplify the expression $\sqrt{p}\div\sqrt{q}$√p÷√q to a single surd.

Simplify the expression $\sqrt[4]{x}\div\sqrt[4]{y}$^{4}√x÷^{4}√y to a single surd.