文档介绍：47+19-38=          
46-19+27=      
76-18+8= 
36+27+26=               
25+8+46=      
55+17-67= 
45-16+39=           
42-19+36=            
74-18-27=              
38-16+17=      
34+58-17=           
53+16-18=
43-25+14=                   
36-27+73=          
32+22+18=     
100-17-44= 
52+16-59=                
52-34-17=           
82-33+36=     
61-39+25= 
32-17 +62=           
91-17-29=            
36+16+37=           
91-25+36=     
40+13+63=     
67-28+17=          
84+9-26=             
29+35+28=           
45+9+36=      
72-17+34=
58-29+36=             
47-18+48=              
47+29-18=            
76-19-18=     
76-38+58=             
46+27-36=               
56-38+28=
75-26+47=    
45+8+37=              
75+17-87=               
35-16+18=             
42-29+26=       
74-68+17=              
64-17+12=               
68-36-18=            
24+58-17=      
53-39+27=             
43+28-23=               
56+17+8=             
53+36-18=
63-25+17=              
73+24-18=              
56-27+36=            
22+28-17=     
42-37+30=             
27+16-23=               
62-49+54=             
62-34+41=       
62-35+13=              
63-49+12=              
52-17+19=             
91-37-23=       
36+26-18=              
81-35-16=              
42+13-21            
77-28+36            
84+19-81=              
39+35-23=              
35+19-17=             
82-3+27=
68-39-18=             
47+28-17=             
67+29-38=         
84-29-24=      
79-28+34=             
26+17-18=             
66-48-13=          
85-56-14=        
72+18-23=             
85+7-34=              
45-36+26=         
72-39+36=      
78-39+36=              
74-37-25=             
68-57+36=         
74+18+8=       
83-49+17=              
83+37-18=             
46+27-18=          
42+59-18=
53-35+17=              
63+34-13=             
64-45+36=          
32+19+36=