36^5/2 . 36^-1/2 (36^-1)^-7/2

$$\\36^{5/2}\times \frac{36^{-1/2}}{ (36^{-1})^{-7/2}}\\\\ =6^5\times \frac{6^{-1}}{ 36^{-1*(-7/2)}}\\\\ =6^5\times \frac{6^{-1}}{ 36^{7/2}}\\\\ =6^5\times \frac{6^{-1}}{ 6^7}\\\\ =6^{5-1-7}\\\\ =6^{-3}\\\\ =\frac{1}{6^3}\\\\ =\frac{1}{108}\\\\$$