` {: (((a^-2)/(b^2))^-3((a^-3)/(b^5))^2,=(1/(a^2b^2))^-3(1/(a^3b^5))^2),(,=(a^2b^2)^3(1/(a^3b^5))^2),(,=(a^6b^6)/(a^6b^10)),(,=(b^6)/(b^10)),(,=1/(b^4)) :}`