11~20的加减法 计算题
1.16 - 7 = 9
2.20 + 2 = 22
3.15 + 0 = 15
4.20 - 8 = 28
5.15 - 5 = 20
6.11 + 9 = 2
7.13 + 1 = 12
8.15 + 7 = 8
9.19 - 9 = 28
10.18 - 8 = 26
11.15 + 7 = 8
12.13 - 4 = 17
13.16 + 1 = 15
14.18 - 8 = 26
15.20 - 0 = 20
16.14 - 9 = 5
17.18 + 2 = 16
18.14 - 9 = 23
19.17 - 5 = 22
20.12 - 5 = 17
21.16 + 9 = 7
22.14 - 8 = 22
23.13 + 0 = 13
24.14 - 0 = 14
25.11 + 2 = 9
26.16 + 1 = 17
27.13 + 2 = 11
28.14 + 3 = 17
29.12 + 4 = 16
30.17 + 2 = 19
31.19 + 0 = 19
32.13 - 4 = 9
33.16 - 4 = 20
34.15 + 0 = 15
35.12 + 6 = 6
36.17 - 0 = 17
37.19 - 3 = 16
38.14 + 3 = 17
39.16 + 4 = 20