$a)$  

$w\left(-2,3\right)=\frac{1}{3}\cdot {\left(-2\right)}^2\cdot 3^3-3\cdot \left(-2\right)\cdot 3^2+{\left(-2\right)}^3\cdot 3=$   

$=\frac{1}{\sout{3}}\cdot 4\cdot {\sout{27}}^9+6\cdot 9+\left(-8\right)\cdot 3=$   $36+54-24=66$  

 

$b)$  

$w\left(2,-4\right)=2^5-\frac{1}{4}\cdot 2^2\cdot {\left(-4\right)}^3-\frac{1}{8}\cdot 2\cdot {\left(-4\right)}^2-\frac{1}{16}\cdot 2\cdot {\left(-4\right)}^4=$  

$=32-\frac{1}{\sout{4}}\cdot \sout{4}\cdot \left(-64\right)-\frac{1}{\sout{8}}\cdot 2\cdot {\sout{16}}^2-\frac{1}{\sout{16}}\cdot 2\cdot {\sout{256}}^{16}=$  

$=32-\left(-64\right)-4-32=32+64-4-32=60$