HERE ARE THE ANSWERS TO YOUR PUZZLES :

 

 

REALLY HARD 

M+(M-L) x (M x M)+(VI-C-V) x (M x M x M) = 5,049,998,094

 

MOST CHALLENGING!!!

 

 

   M/D= 2

 

 

(II x D)+(D x IX)+CX-D= 5,110

 

 

 

 

REALLY EASY 

 

M-M+V=5

 

V+V=10 

 

I-I+M=1000