$Cacular:$  
 $P\ =\ \left(3^2\right)^2-\left(2^2\right)^2$  

 $Calcular:$  
 $M\ =\ \frac{3^5\ x\ 2^8\ x\ 3^6\ x\ 2^4}{3^8\ x\ 2^9}$  

 $Calcular:$  
 $R\ =\ \frac{\left(3^2\right)^4\ x\ \left(4^3\right)^4}{4^{10}\ x\ 3^6}$  

 $Calcular:$  
 $D\ =\ \left(9^3\right)^0\ \ +\ \left(2^2\right)^4$