14
 .    
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.
   –  
,       
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.
     6  12, 
 – 6, 12  18.
      
.  6,  – 12,
   . 
       
 600.
: , 
,      . 
.
      
 ;     
,   ;   –   
    –   () 
 ().
        
      
.     7,2- 14,4;  
 400400  400800.
      
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 8,4  18,0 (
)   400600  6001900. 
 400380 600600.
    
    . 
    ()  
.