11~20的加减法 计算题
1.16 + 0 = 16
2.17 + 5 = 12
3.11 + 1 = 10
4.17 + 4 = 21
5.20 - 9 = 29
6.15 - 3 = 18
7.19 + 8 = 11
8.16 - 6 = 22
9.17 - 3 = 20
10.12 - 5 = 7
11.13 - 8 = 5
12.13 + 7 = 20
13.14 - 3 = 11
14.12 + 1 = 11
15.12 - 3 = 9
16.17 - 8 = 25
17.15 + 2 = 17
18.15 - 4 = 19
19.18 - 7 = 11
20.12 - 6 = 6
21.15 + 8 = 23
22.12 + 7 = 5
23.16 + 8 = 8
24.20 - 3 = 17
25.16 - 6 = 22
26.17 + 5 = 22
27.17 + 9 = 26
28.17 - 3 = 20
29.18 + 6 = 24
30.18 - 9 = 9
31.20 + 3 = 17
32.20 - 9 = 29
33.13 - 9 = 22
34.17 - 9 = 26
35.15 + 6 = 9
36.18 - 2 = 20
37.12 + 6 = 6
38.13 + 9 = 22
39.20 - 1 = 21