1、练习一39-23-13= 45-9-34= 99-85-12= 98-12-84= 59+11+11= 34+18+12= 25+16+13= 14+7+14= 25-8+10= 27-13+20= 44-24+11= 52-28+9= 80-20-60= 84-20-25= 74-50-17= 64-34-17= 40-28+28= 43-29+27=60-30+10= 18+30-11= 30+26+16= 7+18+17= 57+8+18= 62+9+19= 36-23+18= 45+9-34= 99-85+17= 98-84+19= 88-9-72= 82-10-68=练习二88-44
2、-14= 66-33-3= 78-24-14=22+26+18= 36-12+12= 55+25-23=47-25+13= 78-25-15= 33+39-19=58+60-28= 28+31-11= 42+36-22=33+28-18= 36+25-36= 78+13-58=66+50-56= 89-45-44= 93-12-31=87-55-12= 66-33+4= 28+13+22=26-19+24= 33+19-33= 47+14-27=75-25+26= 34-18+36= 19+28-9=33-18+35= 48+16-28= 73-11-22=练习三69-47-11= 58-15
3、-40= 72-35+16= 58-22-27= 5+37+27= 17+33+11= 16+37-22= 7+33+38= 40-16-13= 66-23-18= 32-25+10= 12+35-25= 11+36-39= 40-38+19= 47-19-17= 67+23+3= 16+6+25= 6+18+16=66+14+6= 90-18-10= 88+5-78=78+10-68= 68-59+4= 57-48+29=48-29-9= 55-11+46= 16+55-22= 20-5+45= 50-22+17= 54-25-25= 练习四56-28-8= 68-26-23= 41-19+
4、10=52-14+14= 48+18-37= 17+4+14= 75+16-5= 75+12-5= 18+28+11= 26+25+45= 48-29+10= 16+47-34= 45-36+11= 41-23+10= 55+18+17=68-39-9= 75-37-30= 92-36-30= 65-30-29= 16+55+22= 58+22+13= 17+35-23= 56+14+24= 18+39+16=16+35+25= 76-29-28= 91-22-20= 74-27-29= 93-44-42= 16+37+17= 练习五17-4+17= 75+16-45= 75-26+35=18
5、+28-17= 44-24-18= 67-39-19=98-49+10= 48-8-21= 68-9-57= 69+9-57= 48+23+10= 10+47+33=46+36+19= 45+28+18= 88-44-38= 65-56-5= 35+35+10= 18+35+25= 17+36+33= 40+39+13= 62+28-60= 84-20+27= 74-50+19= 64+37-14= 18+4+14= 8+44+46= 27+44+13= 57+15+11= 38+25+12= 25+8+18=练习六67-18+23= 16-7+25= 26+18-12=66+15-16= 1
6、9+44+11= 66-20-18=79-29-35= 33-4-20= 37-18-4=17+44+22= 8+44-43= 9+44-11= 11+44-22= 21+44-13= 16-7+25= 45-16-14= 77-18-50= 89-10-34= 83-44-23= 45-27+10= 4-65-16= 64-23-19= 66-17-33= 73-34-10= 18+9-19= 64-55+5= 26+15+25= 35+45+10= 27+32+23= 41+19+10=练习七90-47+44= 99-53+35= 72-36+25=50+25-24= 58+22-23=
7、79-38+27=58-47+11= 58+15-40= 58+25-46=88-44+37= 40+16-27= 63+23-18=79-27+9= 38+29-19= 75-37+30=36+28-8= 68+26-28= 55+25-25=91-22+20= 67-39+9= 76-29+28=44-24+18= 93-36+30= 60+30-29=27+11-17= 33+3-20= 50+11-23=34+12-17= 25+13-19= 14-7+14=练习八48+18-21= 45+34-50= 64-56+5=68+19-57= 66+28-16= 69+19-57=88-4
8、4+38= 66+17-33= 63+23-19= 79+9-55= 20+25-17= 60-19+18= 72+18-79= 82-44+23= 49+39-15=48+48-40= 47+19-17= 90-18+10= 25+19-14= 77+14-50= 57-18+11= 38-29+12= 25+33-13= 18-4+17=84-65+28= 30+36-18= 15+16-17= 57-38+18= 30-13+28= 26-15+15=练习九100-89+8= 42-17+28= 56-19+28=61-12-24= 97-69+30= 65+11+19=38+50+5=
9、 27+18+1= 61+10-35=12+54-63= 94-92+30= 69+11+5=4-3+39= 91-7-62= 58+32-35=78+10-86= 27+15-13= 55-47+67=23+37-13= 24+33-33= 23+66-72= 78-59+40= 47+49-86= 47+44+6=70-9+16= 57-12-39= 65+11+19=67+26-36= 13-2+20= 17-3+4=练习十12+54-63= 33+31-13= 74-58+57=23+17+16= 91-7-62= 56+43-87=34+49-22= 87-57-21= 55-47+67=12+82-23= 12+82-23= 15+38+32=78-59+40= 20+73+3= 31+57+6=14+36+37= 57+40+1= 18+45+15=43+35+11= 68+5+2= 19+16+32=
