tolong jawab yg no 7 dong pliss

[tex]\displaystyle \frac{\frac{x^2+y^2}{x+y}}{\frac{x}{y}+\frac{y}{x}} = \frac{\frac{x^2+y^2}{x+y}}{\frac{x^2+y^2}{xy}}=\frac{x^2+y^2}{x+y}:\frac{x^2+y^2}{xy} \\ \frac{x^2+y^2}{x+y}\times\frac{xy}{x^2+y^2} = \frac{xy}{x+y}[/tex]