Question

Agrega 1 / x + 1 / y.

Answer 1

$\frac{1}{x}$ + $\frac{1}{y}$ 

$\frac{1}{x}$$\frac{y}{y}$ + $\frac{1}{y}$$\frac{x}{x}$

$\frac{1y}{xy}$ + $\frac{1x}{xy}$ 

$\frac{1y + 1x }{xy}$

re ordenamos 

$\frac{x+y }{xy}$

Respuesta D)