ZU 4:                                                      
 £££££                                                      
 (RE,IM):=(A,B)*(C,D)                                       
                                                            
 1. IM:=(A+B)(C+D) 12 => IM=AC+AD+BC+BD                     
 2. X :=AC         10                                       
 3. Y :=BD         10                                       
 4. RE:=X-Y         1 => RE=AC-BD                           
 5. IM:=IM-X-Y      1 => IM=AD+BC                           
 ÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀÀ