文档介绍：练****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****二
88-44-14= 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****三
69-47-11= 58-15-40= 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****四
56-28-8= 68-26-23= 41-19+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****五
17-4+17= 75+16-45= 75-26+35=
18+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****六
67-18+23= 16-7+25= 26+18-12=
66+15-16= 19+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****七
90-47+44= 99-53+35= 72-36+25=
50+25-24= 58+22-23= 79-38+27=
58-47+11= 58+15-40= 58+25-46=
88-44+37= 40+16-27= 63