Simplify the following expression.

$\sqrt{3^{-2}}$

${\left(324\right)}^{1/5}$

${\left[{\left(\frac{3}{5}\right)}^{1/4}\right]}^{-1/5}$

${\left(14641\right)}^{0.25}$

${\left(\frac{3125}{243}\right)}^{-4/5}$

$\frac{4}{{\left(125\right)}^{-2/3}}-\frac{1}{{\left(16\right)}^{-3/4}}$

${\left[9{\left({64}^{1/3}+{125}^{1/3}\right)}^3\right]}^{1/4}$