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=             54+29-17=              21+82-60=47-18+48=              62+19-18=             44-5+12= 47+29-18=