    

            

                  
                                                                 

        
1.                             
2.                 
3.                
4.             

             
                  

               
1.    
            10                3  5         10                    
2.    
              3   4   5          20              
3.    
                                                         
4.     
               3  4            0.5                                 15 20                  

 

                    
                            

 

  2015-08-06   

                 