Respuesta :

konrad509
[tex]x^3+y^3=(x+y)(x^2-xy+y^2)\\\\ \text{lcd}\left(\dfrac{x}{x+y},\dfrac{x}{x^3+y^3}\right)=\text{lcm}(x+y,x^3+y^3)=(x+y)(x^2-xy+y^2)=\\ =x^3+y^3 [/tex]