Relax

Respuesta :

[tex]\dfrac ab=\dfrac pq\implies b=\dfrac{aq}p[/tex]

Substituting into the second expression,

[tex]\dfrac{a+b}b=\dfrac{a+\dfrac{aq}p}{\dfrac{aq}p}=\dfrac{ap+aq}{aq}=\dfrac{p+q}q[/tex]