$4^{-2}:4=4^{-2-1}=4^{-3}={\left(\frac{1}{4}\right)}^3=\frac{1}{64}$

${\left(\frac{1}{5}\right)}^2:{\left(\frac{1}{5}\right)}^{-1}=$ ${\left(\frac{1}{5}\right)}^{2-\left(-1\right)}={\left(\frac{1}{5}\right)}^3=\frac{1}{125}$

${\left(1\frac{1}{2}\right)}^{-2}:{\left(1,5\right)}^{-3}=$ ${\left(1\frac{1}{2}\right)}^{-2-\left(-3\right)}={\left(1\frac{1}{2}\right)}^1=1\frac{1}{2}$

${\left(0,25\right)}^{-4}:{\left(\frac{1}{4}\right)}^{-2}=$ ${\left(\frac{1}{4}\right)}^{-4\left(-2\right)}={\left(\frac{1}{4}\right)}^{-2}=4^2=16$