Question 1128623
{{{((p^3 -p^2q + pq^2) / (mp- mq + np -nq))/((q^3 + p^3) /( q^2 -p^2))}}} 


{{{((p(p^2 -pq + q^2) / (m(p- q) + n(p -q)))/((q^3 + p^3) /(( q -p)(q+p))))}}} 



{{{((p(p^2 -pq + q^2) / ((m+ n)(p -q)))/(((p + q) (p^2 - pq + q^2)) /(( q -p)(q+p))))}}} 


{{{((p*cross((p^2 -pq + q^2)) / ((m+ n)cross((p -q))))/((cross((p + q))cross( (p^2 - pq + q^2))) /(cross(-( p -q))cross((q+p)))))}}} 


{{{-p / (m+ n)}}}