Question

Помогите
p-q/p*(p/p-q+p/q)

Answer 1

$frac{p-q}{p}*( frac{p}{p-q}+ frac{p}{q})= frac{p-q}{p}* frac{pq+p ^{2}-pq }{q*(p-q)}= frac{p-q}{p}* frac{p ^{2} }{q*(p-q)}= frac{p}{q}$