Question 721629
multiply the exponents inside the brackets by -8
{{{(m^5n)^-8/(m^-20n^8)}}} = {{{(m^-40n^-8)/(m^-20n^8)}}}
combine like terms in a manner that will give us positive exponents
{{{1/(m^((-20+40))n^((8+8)))}}} = {{{1/(m^20n^16)}}}