共30题用时5分钟

27-19=

12+29=

26-5-16=

38-9=

38+26=

28-19-3=

37-18=

37+16=

25-7-13=

26-17=

51-34=

26-17-5=

35-17=

82-34=

15+3+10=

42-38=

33+49=

12+15+2=

76-59=

73-28=

29-5-7=

35-29=

35+18=

13+2+14=

37-21=

51-34=

30-15-4=

37-37=

35+16=

12+17+1=