文档介绍：58+18﹦           63-29=          84-57=           35+49= 80-27﹦            77+16=          98-29=           47+29=85-58=            27+38=          40+58-63=         72-27+39=67+25-49=         63-58+36=        37+27-19=       90-44+38=51-15+62=         34+49-65=       98-79+25=        43-18+57= 58+18﹦           63-29=          84-57=           35+49= 80-27﹦            77+16=          98-29=           47+29=85-58=            27+38=          40+58-63=         72-27+39=67+25-49=         63-58+36=        37+27-19=       90-44+38=51-15+62=         34+49-65=       98-79+25=        43-18+57= 89-37=    51-39=   52-27=   63+37=   62+19=   47+19= 63-27=    61-26=   48+23=   57-48=   42-17=    86-54=54+28=   27+36=   48+23=  57-48=  54+29=  42-17= 86-54=  54+28=  27+36=  65-36=  54-45= 35+27=84-48=  40-29=  48+48=  60+25=   72-45= 46-38= 56-28=  78-69=  72-37=   53+28=  96-59= 75+17= 54+37= 59+19=  55-47=   73+29= 56-27=   92-59=12+29-19=  69+10-36=   27+12-28=   67+27-37=  72-54+12= 35+12-28=  62-18+24=   53-29+19=   12+79-62=  75-24+26=58+18﹦           63-29=          84-57=           35+49= 80-27﹦            77+16=          98-29=           47+29=85-58=            27+38=          40+58-63=         72-27+39=67+25-49=         63-58+36=        37+27-19=       90-44+38=51-15+62=         34+49-65=       98-79+25=        43-18+57= 58+18﹦           63-29=          84-57=           35+49= 80-2