共30题 用时5分钟

27－9＝

40－2＝

41－2＝

32－4＝

38－9=

20－9＝

72－2＝

30－2＝

66－4＝

53＋5＝

8＋50＝

35＋2＝

39－4＝

20－7＝

20－1=

14 - 9 =

60+8=

9 + 2 =

11 - 9 =

9 + 3 =

12 - 9 =

9 + 4 =

13 - 9 =

9 + 5 =

9 + 9 =

17 - 9 =

9 + 8 =

16 - 9 =

9 + 7 =

15 - 9 =