共30题用时5分钟

15+3+10=

18+26=

20-6-5=

10+15+4=

54-26=

30-8-16=

9+7+14=

34+38=

30-13-8=

12+15+3=

76-54=

30-13-15=

13+2+14=

28-2-19=

30-15-4=

29-5-7=

26-7-18=

12-8+16=

28-3-16=

30-16-14=

17-8+15=

30-18-9=

30-11-13=

28-9-19=

64-13=

54-28=

27-18+8=

58+16=

56-27=

13+16-15=