共30题用时5分钟

15-9+15=

7+19-15=

42+19

14-12+18=

18+6-19=

35+27=

28-12-14=

15-8+15=

34+6=

26-10-15=

20+8-16=

35+25=

26-16-8=

28-9-19=

26+34=

23-14-6=

28-9+12=

18+42=

25-17-3=

27-18+8=

35+42=

24-7-13=

15+14-19=

62-38=

26-8-14=

12-5+17=

51-18=

29-4-17=

9+18-9=

52-16=