5xy × [tex]\frac2x}{10}[/tex] × [tex]\frac{1}{x^{3} }[/tex] × [tex]\frac{1}{y}[/tex] = [tex]\frac{10xy^{2} }{10x^{3}y }[/tex] = [tex]\frac{y^{2} }{x^{2} }[/tex] = [tex](y/x)^{2}[/tex]
