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=

6+19= 43-7= 44-6= 23+6= 30+19= 9+16= 4+22= 11+34= 26+9= 15-6= 28-2= 15+3= 3+13= 42-3= 3+45= 33-4= 6+11= 13+24= 15+19= 2+46=

43-8= 30+1= 24+11= 28+14= 25-4= 22+20= 23+4= 30+4= 14+32= 1+46= 36-5= 3+11= 8+2= 30-3= 2+39= 42-2= 2+25= 7+15= 13+18= 19-5=

29+9= 11+4= 25-7= 6+20= 9+25= 40+2= 9+20= 24+1= 28+6= 3+42= 24+2= 38+7= 34+9= 22+15= 9+3= 6+38= 1+32= 36+5= 6+13= 27+3=

49-4= 29+19= 30+18= 17-8= 32+4= 39-2= 35+8= 4+23= 37+7= 24+8= 17+31= 13+34= 8+22= 3+7= 26-5= 15+4= 3+43= 7+20= 24+12= 20+18=

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= 19+1= 38+8= 14+24= 9+38= 13+1= 13-1= 39+5= 17+14= 10+26= 32+13= 23+20= 13-9= 18+8= 8+26= 20+11= 14-8= 14+28= 47-5= 25+18=

27+15= 5+37= 26+20= 14+27= 42-5= 33-1= 44-9= 2+38= 14+12= 13-5= 37-6= 18+29= 5+21= 48-4= 13+20= 17+19= 5+6= 29+10= 12-5= 23-8=

22+13= 18+16= 18+11= 20+19= 12+10= 17+8= 24-6= 14-5= 42+3= 2+28= 9+23= 25+19= 15+35= 7+42= 33-2= 32-7= 9+34= 6+24= 33-6= 14+5=

10+22= 13+7= 8+37= 22+28= 2+35= 39+6= 44-4= 26+11= 12+22= 15+34= 18-5= 10+18= 49-7= 22+19= 47-9= 21+25= 1+6= 4+31= 30+2= 38+11=

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= 35+2= 26+22= 35+7= 34+5= 2+24= 17+25= 1+42= 25+17= 17+4= 21+29= 15-9= 13+28= 21+4= 9+32= 33+13= 12+17= 33+5= 15+2= 14+20=

7+14= 18-9= 38+2= 28-2= 2+2= 31+1= 25+14= 24-8= 4+33= 38-9= 23+26= 14-7= 16-3= 10+32= 12+1= 3+17= 30+18= 4+39= 41+9= 29-5=

13+16= 33-5= 20+3= 49-1= 12+2= 5+12= 7+8= 36-1= 14+12= 8+41= 2+48= 24+7= 2+22= 1+39= 22+4= 14+11= 6+26= 14+16= 6+13= 3+12=

40-4= 8+10= 26+21= 21-1= 12+10= 36+13= 1+3= 29+2= 15+4= 29+17= 47+1= 22+28= 19+24= 29+21= 2+41= 31+12= 3+21= 39+6= 38-7= 20+30=

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=

1+21= 5+35= 24+2= 12+9= 29+1= 11+7= 28+20= 31+8= 13-5= 2+33= 3+29= 16+2= 20+16= 16+31= 40+7= 41-1= 42+1= 11+31= 30+10= 6+8=

17-3= 15+7= 8+31= 19+25= 7+5= 35-7= 14-3= 41-6= 14+15= 3+15= 3+22= 14+18= 26+19= 19+31= 33-7= 9+12= 30+16= 10+36= 18+1= 21+8=

1+13= 7+27= 5+29= 42+6= 32+9= 18+21= 3+7= 9+16= 4+4= 22+21= 21+17= 17+23= 19-6= 16+8= 47-5= 21+9= 13+22= 25+18= 14-5= 3+46=

18+17= 18-5= 7+24= 16+24= 9+28= 7+42= 35-5= 16+20= 23+15= 3+4= 21+13= 12+15= 19+16= 4+30= 23+6= 40-2= 34-2= 42+8= 49-6= 21+21=