    2014---2015          
                     
   
      1. 1  3  10   3       
    4 6  20   5      
  2. 1  3  3                   
    4 6  5                   
  3.        
①   
②      
③     
  4.            
  5.      
  6.                            
            
  7.            5      
                                   
                                          
                                             2015.1.9