下列计算正确的是（　　）

A．	$\frac{x^2}{y^2}=\frac{x}{y}(y\ne 0)$	B．	$x{y}^2÷\frac{1}{2y}=2\mathit{xy}(y\ne 0)$
C．	$2\sqrt{x}+3\sqrt{y}=5\sqrt{\mathit{xy}}(x⩾0,y⩾0)$	D．	${\left(x{y}^3\right)}^2=x^2{y}^6$