Question 177658
{{{((9a^3)/(10b^4))^-2}}}  =   {{{1/((9a^3)/(10b^4))^2}}}  =   {{{1/((81a^6)/(100b^8))}}}  =  {{{1/1}}}x{{{(100b^8)/(81a^6))}}}   =  {{{(100b^8)/(81a^6)}}}