共30题 用时5分钟

82-7=

41-6=

45-8=

43-4=

21-4=

50-9=

32-5=

13-6=

71-7=

21-9=

70-7=

33-4=

85-8=

64-8=

14-8=

74-5=

98-9=

11-4=

91-8=

31-2=

72-9=

62-6=

43-8=

100-5=

11-4=

63-8=

93-9=

98-9=

84-6=

30-7=