文档介绍：78-29+18=             26+17-18=              64-19+22=     
 
47+19-38=           66-48-13=           75-55+44= 
46-19+27=       85-56-14=         56-36-15=         
76-18+8=  72+18-23=              67-60+56=    
36+27+26=                85+7-34=              85-50+29=      
 
25+8+46=       45-36+26=          42-32+24=   
55+17-67=  72-39+36=        55+38-19=        
45-16+39=            78-39+36=              15+24+22=
42-19+36=             74-37-25=              69+24-19=    
74-18-27=               68-57+36=          93-56+27=
38-16+17=       74+18+8=        23+32+12=     
34+58-17=           83-49+17=               42+24-19= 
61-39+25=  72+26-13=              40-12+27=      
 
32-17 +62=            52-37-13=          76-37-48=           
 
91-17-29=             54-35+36=        79-64+38=           
  
36+16+37=            89-37-23=               56+46-36=             
91-25+36=      51-39+17=             55+38-50=          
48+13+27=      52-27+36=          93-56+35=
91-25+36=      51-39+17=              55+38-50=  
48+13+27=      52-27+36=          93-56+35=
67-28+17=            63-27-13=        23+32-19=   
84+9-26=              63+37-17=               56+28-60=
29+35+28=            61-26-23=             21+82-60=    
 
45+9+36=       48+23-17=           36+34-14=     
     
72-17+34= 57-48+36=               73+12-71=          
58-29+36