练习题一
11+23= 28+7= 14+10= 17-6= 8+19= 2+30= 12+11= 7+24= 27+7= 7+13= 11-5= 22-2= 35-3= 7+25= 29-5= 10+13= 15+28= 15+20= 3+20= 14+34= 4+22= 42-3= 43-8= 30+4= 2+39= 11+4= 28+6= 6+38= 30+18= 24+8= 3+43=
6+19= 11+34= 3+45= 30+1= 14+32= 42-2= 25-7= 3+42= 1+32= 17-8= 17+31= 7+20= 43-7= 26+9= 33-4= 24+11= 1+46= 2+25= 6+20= 24+2= 36+5= 32+4= 13+34= 24+12= 44-6= 23+6= 15-6= 28-2= 6+11= 13+24= 28+14= 25-4= 36-5= 3+11= 7+15= 13+18= 9+25= 40+2= 38+7= 34+9= 6+13= 27+3= 39-2= 35+8= 8+22= 3+7= 20+18=
30+19= 15+3= 15+19= 22+20= 8+2= 19-5= 9+20= 22+15= 49-4= 4+23= 26-5= 9+16= 3+13= 2+46= 23+4= 30-3= 29+9= 24+1= 9+3= 29+19= 37+7= 15+4=
练习题二
25+20= 19-6= 46-8= 27+22= 4+44= 8+3= 13+9= 24+9= 19+28= 38+12= 7+2= 11-4= 21+9= 18-2= 21+4= 27-3= 9+7= 47-3= 8+24= 12-3= 4+33= 39+5= 18+8= 27+15= 2+38= 13+20= 18+16= 14-5= 33-2= 13+7= 12+22= 21+25=
19+1= 38+8= 14+24= 9+38= 13+1= 17+14= 10+26= 32+13= 23+20= 8+26= 20+11= 14-8= 14+28= 47-5= 5+37= 26+20= 14+27= 42-5= 33-1= 14+12= 13-5= 37-6= 18+29= 5+21= 17+19= 5+6= 29+10= 12-5= 23-8= 18+11= 20+19= 12+10= 17+8= 42+3= 2+28= 9+23= 25+19= 15+35= 32-7= 9+34= 6+24= 33-6= 14+5= 8+37= 22+28= 2+35= 39+6= 44-4= 15+34= 18-5= 10+18= 49-7= 22+19= 1+6= 4+31= 30+2= 38+11=
13-1= 13-9= 25+18= 44-9= 48-4= 22+13= 24-6= 7+42= 10+22= 26+11= 47-9=
练习题三
11+38= 24-2= 4+19= 32-8= 20+25= 26+20= 34-5= 17+20= 3+2= 6+32= 14+2= 16-9= 15-7= 2+43= 36+6= 1+17= 13+30= 36+7= 32+14= 5+33= 8+18= 1+42= 9+32= 7+14= 24-8= 12+1= 33-5= 14+12= 14+11= 26+21= 29+17= 31+12=
35+2= 25+17= 33+13= 18-9= 4+33= 3+17= 20+3= 8+41= 6+26= 21-1= 47+1= 3+21= 26+22= 35+7= 34+5= 2+24= 17+4= 21+29= 15-9= 13+28= 12+17= 33+5= 15+2= 38+2= 28-2= 2+2= 31+1= 38-9= 23+26= 14-7= 16-3= 30+18= 4+39= 41+9= 29-5= 49-1= 12+2= 5+12= 7+8= 2+48= 24+7= 2+22= 1+39= 14+16= 6+13= 3+12= 40-4= 12+10= 36+13= 1+3= 29+2= 22+28= 19+24= 29+21= 39+6= 38-7= 20+30=
17+25= 21+4= 14+20= 25+14= 10+32= 13+16= 36-1= 22+4= 8+10= 15+4= 2+41=
练习题四
18+5= 11+22= 31+16= 16+10= 34+7= 36+4= 16+7= 14-8= 12+20= 17+26= 30-2= 35+5= 15+12= 17+13= 10+15= 8+42= 27+21= 14+29= 45-9= 46+1= 28+20= 16+31= 17-3= 41-6= 19+31= 1+13= 9+16= 47-5= 18-5= 23+15= 23+6=
1+21= 31+8= 40+7= 15+7= 14+15= 33-7= 7+27= 4+4= 21+9= 7+24= 3+4= 40-2= 5+35= 24+2= 12+9= 29+1= 11+7= 13-5= 2+33= 3+29= 16+2= 20+16= 41-1= 42+1= 11+31= 30+10= 6+8= 8+31= 19+25= 7+5= 35-7= 14-3= 3+15= 3+22= 14+18= 26+19= 9+12= 30+16= 10+36= 18+1= 21+8= 5+29= 42+6= 32+9= 18+21= 3+7= 22+21= 21+17= 17+23= 19-6= 16+8= 13+22= 25+18= 14-5= 3+46= 18+17= 16+24= 9+28= 7+42= 35-5= 16+20= 21+13= 12+15= 19+16= 4+30= 34-2= 42+8= 49-6= 21+21=
练习题五
34+16= 14-2= 22+20= 13-8= 12-6= 33+2= 13+27= 7+39= 11-7= 36+12= 24-8= 12-4= 32+11= 6+7= 10+29= 22+22= 6+33= 20+4= 35-9= 18+23= 11+11= 47-8= 17+33= 19-1= 4+44= 9+3= 17-5= 8+31= 39+8= 12+11= 2+39= 2+27=
12+24= 12-7= 20+23= 42-9= 33-2= 28+16= 27+4= 22+12= 2+38= 36+11= 28-8= 5+41= 2+28= 3+30= 16+5= 38-6= 23+9= 1+47= 28-4= 31+11= 47+2= 3+36= 15+29= 4+17= 12+20= 12+1= 31-4= 23-9= 21+6= 24+8= 46+2= 29+13= 15+8= 3+6= 3+20= 47-3= 2+36= 21-5= 46-8= 6+19= 49-5= 34-1= 14+32= 3+15=
20-8= 15+3= 39-7= 2+7= 4+43= 44-1= 7+34= 17-9= 9+1= 24-1= 38+3= 19+21= 19+28= 12+22= 14+30= 18+19= 24-7= 40-1= 15+14= 29+2= 2+35= 16+1= 15+30= 10+38=
练习题六
8+6= 42+2= 13+17= 4+42= 2+42= 14-7= 35+13= 27-4= 17+24= 8+29= 47-2= 8+32= 41+5= 7+37= 18+11= 3+32= 26+6= 39-3= 22+23= 4+20= 16+4= 23+18= 1+43= 4+33= 40-9= 8+38= 22+21= 14+25= 18+28= 2+29= 15-6= 15+5= 19+14=
13+34= 8+15= 18+1= 1+21= 27+12= 16+10= 12+16= 19+17= 8+21= 31+3= 11+32= 10+13= 9+31= 25+5= 6+14= 16+25= 7+31= 23-8= 1+20= 33+10= 28+7= 15-3= 5+27= 18-9= 18-8= 12+18= 6+38= 3+24= 30+7= 18+29= 13+28= 16+8= 16+20= 16+33= 20+1= 45-6= 7+11= 1+28= 37+6= 12+14= 42+5= 12+28= 19+8= 31-9= 26+11= 9+26= 5+32= 34+5= 11+27= 28+4= 27+13= 28+6= 25+6= 23+1= 7+40=
22+26= 4+5= 13+22= 23-1= 23+8= 3+41= 21+20= 40-3= 39-9= 25-3= 32+8= 22+27=
练习题七
41-5= 34+3= 14+11= 1+13= 24-5= 17-8= 4+26= 42+6= 23+14= 10+24= 15+18= 5+27= 11-5= 14+22= 15+15= 42+8= 22-2= 22+24= 3+21= 3+19= 29+12= 5+20= 15+33= 49-8= 39-1= 34-1= 21+11= 22+26= 2+3= 29-8= 30-3= 22+11=
11+28= 5+45= 41-6= 8+11= 4+7= 2+14= 12+18= 26+16= 18+11= 28+21= 1+24= 15-7= 13+37= 1+47= 1+31= 6+35= 23+13= 17+30= 26+6= 37+9= 20-7= 37+7= 29-5= 8+15= 1+42= 38-1= 26-5= 17+21= 4+2= 24+10= 13+11= 7+28= 46-2= 25-1= 1+23= 29-4= 34+2= 22-7= 30-6= 35+14= 16-1= 38-3= 3+36= 32-4= 2+37= 18+16=
36+5= 20+10= 25+5= 31+3= 12+32= 18+12= 29+8= 1+5= 21+20= 46-7= 18-7= 14+9= 19+4= 3+6= 23+1= 32+9= 39+9= 25+4= 25-7= 13+33= 12+21= 10+27=
练习题八
34+11= 23+2= 22+15= 5+32= 4+16= 15-9= 36+12= 8+28= 18+20= 11-7= 35+1= 6+34= 6+13= 13+25= 45-7= 21+26= 31-8= 15-2= 20+8= 7+36= 19+24= 18+10= 15+1= 1+18= 1+16= 9+19= 20+21= 45+1= 35+9= 12+34= 37+11= 21-2=
29-1= 28+7= 10+6= 17-4= 6+10= 27-3= 8+2= 44+6= 22+6= 14+32= 8+37= 45-1= 39+3= 35+11= 3+29= 44-1= 24+23= 21+10= 28+22= 28-1= 18-8= 21+25= 13+5= 12-7= 2+2= 40-5= 31+10= 22+25= 33+10= 13+15= 18+22= 33-5= 24+17= 22+2= 27+21= 41-1= 25+1= 18+23= 7+29= 17+4= 3+24= 21+12= 24+16= 39-8= 13+36= 45+3= 6+1= 40+3= 26+21= 47-2= 11+12= 10+11= 34+6= 22-6= 15-6= 15+11= 49-3= 30+15= 23+16= 27-8= 10+3= 19+27= 21+3= 19+15= 15+2= 8+14= 19+9= 4+24=
练习题九
38+3= 46+3= 4+38= 47-2= 6+2= 19+11= 13+36= 37+10= 22+9= 23+25= 23-2= 7+5= 41-2= 14+15= 35+3= 11+7= 21+17= 5+37= 15+7= 1+30= 10+3= 16-2= 36-1= 16+21= 18-2= 31+12= 18+30= 33+9= 10+28= 38-2= 23+21= 5+26=
30+9= 26+11= 11-1= 22+2= 36-5= 9+22= 17+8= 12+22= 19+14= 24+3= 6+40= 1+29= 44-1= 45-2= 1+10= 33+12= 48-6= 45+4= 16+4= 30+2= 9+18= 1+4= 2+34= 14+14= 36-8= 9+32= 16+18= 40-5= 17+15= 10+26= 13-4= 26+19= 30+20= 14+8= 13+9= 22+13= 14+16= 24+15= 8+29= 4+42= 39-6= 21+16= 6+24= 30-9= 13+1= 26+24= 11+10= 43-1= 8+23= 42+7= 20+3= 2+6= 3+13= 8+6= 1+39= 15-5= 19+9= 9+35= 31-2= 27+8= 12-3= 34-3= 1+40= 19+16= 23-4= 21+18= 20+20= 26+6=
练习题十
1+45= 14+24= 27+9= 42-1= 11+19= 9+29= 3+40= 26+22= 35+11= 11+4= 32-4= 16+27= 9+27= 14+9= 7+35= 15+10= 2+3= 13+29= 19-2= 41-5= 15+31= 13+12= 37-8= 22+16= 18+19= 15-1= 2+41= 17+11= 29-3= 15+9= 47-4= 34+10=
44-5= 29-7= 37+7= 40+2= 34+13= 41-4= 34-2= 12+37= 13+24= 40+9= 10+37= 24+26= 4+28= 18+2= 33+10= 20+13= 11+35= 28+11= 29+20= 5+43= 20-7= 28+17= 11+26= 45-5= 41+2= 13+4= 36+7= 4+1= 1+1= 21-4= 22-3= 45+1= 17+6= 5+5= 1+3= 28-6= 13+17= 26-1= 33-1= 35-1= 12+6= 30+12= 27+2= 3+35= 8+26= 7+14= 29+13= 24+8= 17+5= 17+9= 12+9= 3+14= 19+22= 1+22= 14-7= 17+3=
20+23= 13+33= 23+5= 24-5= 5+38= 12+11= 27+23= 8+39= 22+28= 8+13= 9+28= 12+3=
练习题十一
15-5= 24-8= 31-2= 8+12= 17-4= 21+14= 27+4= 5+33= 4+18= 44-8= 9+26= 45-1= 6+13= 40-7= 21+3= 36-7= 32+3= 12+12= 2+48= 47-8= 3+8= 40-8= 28+9= 24+3= 13+34= 4+26= 4+33= 31+6= 14+8= 42+6= 23+1= 26+24= 6+2=
17-9= 16+14= 29-1= 48-9= 2+9= 17-5= 9+30= 39-8= 14+18= 9+32= 10+14= 15+20= 14+22= 15+9= 6+43= 35+11= 46-9= 33+15= 23+23= 16+15= 3+41= 11+5= 28+8= 2+37= 3+31= 30-2= 18+22= 7+19= 11-7= 29+17= 1+25= 40+1= 32-4= 11+6= 25+9= 20+9= 3+9= 35+13= 9+31= 23-6= 17+9= 17+2= 6+30= 16-5= 42-1=
33-9= 40-3= 15+10= 48-5= 6+33= 41-3= 27+7= 9+21= 27+12= 29+3= 6+36= 19-4= 46-7= 39+8= 13+36= 40-1= 10+23= 12+28= 4+43= 19+8= 12+38= 29+21=
练习题十二
7+40= 33-3= 20+14= 49-2= 31-5= 11+4= 15+15= 16+19= 41+5= 13+3= 28+5= 46-4= 40-2= 26+8= 16-4= 41-5= 24-3= 34+9= 8+23= 39+7= 27+16= 11+37= 2+32= 36+5= 4+13= 32-7= 1+33= 7+24= 20+26= 13+9= 2+44= 16+29=
36+11= 48-7= 13+18= 14+34= 1+26= 5+18= 7+23= 39+5= 29-5= 7+42= 34+1= 4+42= 8+39= 40-9= 15-8= 27+15= 37-2= 9+23= 2+29= 17+28= 2+41= 31-6= 19+30= 9+37= 49-5= 34+14= 5+30= 31+9= 6+22= 17+15= 21+4= 22-4= 44-4= 11+39= 15+33= 7+32= 3+44= 6+18= 27+20= 18+7= 39+4= 21+27= 17+31= 23+14= 42-2= 11+10=
20+6= 30+5= 42+8= 26+12= 12+29= 7+17= 19+1= 4+28= 38+7= 5+23= 21-2= 49-3= 20+3= 44+3= 8+26= 48-4= 11+24= 26+19= 30+12= 44+1= 3+43= 13+21=
练习题十三
18+24= 12+3= 11-5= 45+1= 13+17= 15-2= 16+1= 30+16= 1+13= 18+29= 1+14= 25-7= 4+26= 7+37= 19+29= 35+1= 12+7= 8+27= 11+25= 23+3= 29+13= 12+28= 32+16= 20+27= 8+22= 16+23= 15+12= 45+5= 13+16= 11+37= 45+3= 31-4=
1+24= 37+11= 15+11= 15+30= 19+23= 1+15= 4+42= 8+40= 8+21= 29+12= 33-3= 19+16= 4+20= 14+9= 11+3= 11+14= 18+18= 25+15= 36+13= 40-1= 42-6= 2+23= 9+28= 7+43= 11+32= 14-3= 10+16= 13-6= 6+33= 3+15= 6+40= 8+25= 19-2= 7+34= 25+6= 3+36= 42-9= 28+1= 35+6= 5+33= 45-5= 1+45= 32+2= 21-7= 17+1= 32-5= 21-2= 16+3= 49-9= 13+9= 31+11= 20-3= 9+4= 49-4= 9+30= 18-5= 11+4= 13+4= 2+40= 28+5= 27+16= 34-6= 5+28= 4+37= 45-1= 20+12= 7+15= 4+25=
练习题十四
6+35= 6+27= 14-1= 44+6= 34-2= 4+1= 13+23= 22+13= 13+10= 30+2= 29+7= 47-2= 12+34= 34-8= 19+7= 47-1= 15+21= 7+27= 29+5= 19-5= 26-7= 24+9= 5+4= 28+16= 22+19= 12+6= 8+19= 36+10= 24-7= 27+23= 6+32= 37-5= 18+3=
7+41= 16+13= 48-9= 4+7= 9+9= 13+36= 2+33= 2+25= 29-4= 39-9= 27-9= 26+13= 35+11= 34-4= 3+30= 9+40= 21+29= 27+1= 18+6= 32-3= 1+1= 30+7= 10+26= 17+19= 18+23= 4+28= 9+15= 30+1= 32+6= 4+22= 35+8= 29+17= 24+19= 44-4= 7+22= 32+12= 14+21= 21+27= 16+34= 10+32= 37+7= 10+14= 11+16= 26+19= 14+27= 39+9= 25+1= 4+44= 20-5= 31-7= 36-5= 18-7= 11-1= 11+36= 12+13= 20+24=
41+4= 14+23= 6+11= 29-6= 9+35= 10+9= 11+23= 3+28= 20+10= 20+6= 22+16=
练习题十五
10+14= 32+14= 3+4= 29+18= 7+16= 17+33= 1+25= 1+38= 18+5= 34+4= 20+20= 3+20= 23-7= 13+24= 41+7= 38-2= 38-5= 27+21= 35+14= 14+32= 19+13= 1+29= 17-7= 5+37= 24+12= 42-9= 43+7= 23+4= 10+16= 3+28= 1+14=
25+19= 29-7= 3+23= 22+28= 29+10= 8+31= 17-4= 43-7= 21+8= 24+16= 15+2= 40-3= 40+9= 15+13= 15+14= 25+1= 23+7= 9+22= 42+8= 11+7= 22+18= 7+36= 35+13= 4+35= 6+38= 28+14= 19-4= 22+20= 20-7= 42-3= 3+29= 33-9= 33+11= 11+16= 30-8= 19+14= 23-9= 24+15= 6+44= 10+27= 35+3= 40-9= 4+6= 28+13= 10+20= 12+1= 37+3= 6+36= 20+7= 34-9= 23+20= 17+17= 1+42= 9+15= 44+5= 4+44= 28+3= 7+14=
9+13= 34+11= 45+2= 18+2= 46-4= 2+36= 17+15= 42+2= 28+17= 27-2= 14+12=
练习题十六
9+30= 11+13= 23-3= 19+17= 41-8= 37-2= 10+9= 48-9= 14-7= 9+26= 27-9= 38-4= 7+39= 11+24= 7+7= 34+16= 11+22= 42+1= 3+27= 22+11= 8+20= 4+26= 37-5= 43+1= 33+6= 45-1= 10+33= 10+31= 5+4= 7+22= 16+12=
4+9= 14+3= 3+18= 6+42= 20-5= 13+34= 47+3= 9+38= 43+4= 26+15= 10+5= 19-9= 3+2= 38-7= 39-8= 22+3= 35+5= 29+4= 1+45= 23-4= 9+5= 45-9= 4+25= 41-2= 18+23= 13+5= 9+28= 5+25= 38-1= 33-2= 21+25= 5+36= 32-9= 14+16= 39+6= 13+10= 19+27= 21+21= 46+1= 4+34= 37+8= 27+6= 37+2= 24+24= 12+37= 1+3= 26+16=
5+12= 5+44= 25-8= 5+42= 23+11= 22+13= 42+4= 4+27= 12+4= 1+26= 25+6= 26+17= 49-7= 10+29= 30+15= 17+5= 4+36= 12+6= 8+12= 9+8= 1+27= 21+13=
练习题十七
20+2= 17-8= 17+3= 3+15= 22+19= 23+9= 3+27= 19+10= 44+6= 28-7= 8+36= 19-7= 6+38= 16+21= 29+14= 6+33= 1+26= 41+3= 23+11= 19+3= 12+37= 21+14= 3+39= 19+1= 19+8= 9+11= 13+17= 28+3= 48-2= 7+19= 5+40= 1+23=
6+28= 7+31= 22+6= 24+23= 19+26= 16+6= 15+10= 31+11= 19+15= 13+25= 17+8= 10+24= 2+23= 8+7= 35-1= 12+3= 10+39= 47+2= 20+5= 16-1= 27+13= 31-1= 25+1= 4+5= 23-7= 1+21= 6+24= 19+27= 2+1= 2+8= 23+24= 7+38= 18+21= 3+22= 13+21= 23+23= 6+16= 29+9= 3+26= 20+7= 23+3= 29-1= 8+18= 13+30= 8+33= 11-5= 21-1= 25+5= 13+35= 40+9= 30-4= 19+21= 5+37= 17-7= 10+1= 5+45=
27+18= 29+2= 1+8= 7+42= 3+14= 25+24= 43+4= 10+9= 26+18= 12+14= 15+3= 36+1=
练习题十八
15+7= 47-9= 43-5= 39+2= 11+37= 5+39= 23+2= 18+22= 44-7= 19-8= 17+24= 30+3= 8+16= 28-8= 16+19= 13+3= 16-9= 24+14= 14+22= 41-4= 24+5= 31+8= 19+11= 22+28= 17-5= 34-7= 4+45= 6+30= 28+21= 19+6= 39+8= 48-7=
37+12= 36+4= 18+9= 23+22= 16-8= 16+5= 21+28= 17+9= 8+27= 4+16= 11-9= 9+34= 37-8= 34+11= 4+13= 43-6= 11+27= 39+11= 13+32= 26+11= 21+18= 21-3= 26+5= 34+3= 7+37= 46-1= 14-1= 23-3= 35-9= 23+25= 21+5= 36+11= 21+26= 15+1= 14-5= 35+12= 26-8= 20+27= 11+33= 14+9= 13+1= 14+20= 33-1= 8+19= 23-5= 33+6= 16+12= 30+17= 34+15= 17+23= 6+34= 12-1= 32+18= 28-9= 39-9= 1+25= 39+7= 13-6= 4+39= 27+15= 34+1= 12+25= 44-1= 43+1= 27+4= 28+6= 7+10= 27+7=
练习题十九
24-9= 16-3= 33-1= 8+27= 4+42= 11+15= 13+30= 19+18= 14+4= 46-6= 27+14= 16-4= 28+2= 1+11= 14-6= 27+1= 35+6= 35+9= 7+3= 6+8= 35+3= 1+7= 14+36= 31+4= 5+21= 30-8= 3+37= 35+1= 29+7= 39+3= 17+22= 18-3=
2+21= 15+7= 4+18= 6+34= 2+19= 2+10= 15-9= 44-4= 21+12= 19+27= 33+8= 11-9= 10+34= 19-4= 47-3= 18+20= 22-3= 47+3= 21+27= 20-9= 13+5= 9+1= 4+46= 2+15= 38+10= 23+12= 45+5= 9+22= 20+9= 28+19= 1+31= 37+5= 26+19= 23+24= 16+9= 22+6= 3+18= 4+11= 5+17= 28+21= 4+39= 7+8= 10+26= 37+3= 32-3= 1+13= 12-4= 36+5= 3+31= 25+18= 11+18= 37-9= 8+28= 17-6= 26+5= 30+3= 21+22=
9+34= 17+18= 17-8= 4+19= 17-1= 48-4= 20+6= 42+1= 15+18= 16+17= 41-4=
练习题二十
9+32= 30+19= 5+2= 47-9= 31+9= 6+27= 3+7= 25+16= 22+11= 22+26= 12+2= 33+3= 47-7= 18+13= 12+18= 17+8= 49-1= 37-2= 16-1= 18+27= 27+17= 40+10= 8+30= 30+18= 36-3= 24+9= 13+28= 6+10= 6+28= 22+28= 7+19= 44+1=
4+3= 28+16= 2+12= 13+29= 16+15= 4+16= 27+18= 34-1= 18+12= 19+30= 38+12= 5+37= 20+12= 39+9= 16+14= 8+11= 35-9= 29+21= 8+6= 19+7= 4+2= 17+17= 4+23= 2+4= 1+28= 29+1= 6+13= 18+23= 46-9= 13-7= 31+11= 48-2= 9+26= 29+3= 20+18= 40+9= 36-4= 9+15= 42+4= 46+4= 38+4= 32+18= 33+13= 27+2= 23+3= 36+3=
23-2= 21+4= 34-2= 20+19= 25-5= 49-6= 4+7= 40-9= 11-3= 22+18= 5+22= 23+13= 25+8= 4+37= 24+1= 30+17= 4+5= 14+34= 16+16= 17+23= 24-1= 41-3=
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