     
                   

1.
      
        
2.
      
       
3.
      
       
4.
       
        
5.
      
        
6.
     
      
7.
     
       

 
   
       
   
       

 
     
          
     
          
    
        

            
1.
                  
2.
        
        
3.
       
     
     
       
4.
        
        
        
5.
              
              

       
1.
         
         
2.
                 
3.
          
                  
4.
     
     
        
5.
           

       
1.                         
                                       
                                 
                                     
           
2.     
  =   +   +    
①       
②            
③                         
               

         
①               
②              
③   15       30       
④           
⑤                    
⑥       15       
               

                              