11~20的加减法 计算题
1.18 - 9 = 27
2.16 + 3 = 13
3.13 - 0 = 13
4.18 - 8 = 26
5.18 + 8 = 10
6.19 + 8 = 27
7.13 + 3 = 16
8.13 + 2 = 15
9.20 + 6 = 14
10.17 + 1 = 18
11.16 + 6 = 10
12.12 - 1 = 11
13.11 - 8 = 19
14.15 + 5 = 20
15.13 - 3 = 16
16.17 + 2 = 15
17.18 - 5 = 13
18.17 - 0 = 17
19.17 - 8 = 9
20.16 + 4 = 20
21.17 - 5 = 12
22.12 - 9 = 21
23.11 - 1 = 12
24.12 - 5 = 17
25.15 + 6 = 21
26.14 + 3 = 17
27.12 + 0 = 12
28.12 - 6 = 6
29.18 + 8 = 10
30.11 - 2 = 9
31.20 + 7 = 13
32.15 + 3 = 12
33.15 + 9 = 24
34.15 - 2 = 17
35.12 + 3 = 15
36.15 - 1 = 14
37.18 + 1 = 17
38.14 + 3 = 11
39.12 + 6 = 6