下列计算正确的是 $($ 　　 $)$

A．	$x^2·x^3=x^6$	B．	$x{y}^2-\frac{1}{4}x{y}^2=\frac{3}{4}x{y}^2$
C．	${(x+y)}^2=x^2+y^2$	D．	${\left(2x{y}^2\right)}^2=4x{y}^4$