11~20的加减法+20以内加法（进位） 计算题
1.15 + 8 = 23
2.18 + 3 = 15
3.15 + 1 = 14
4.12 + 4 = 16
5.12 + 10 = 22
6.19 + 4 = 23
7.12 + 2 = 10
8.14 - 6 = 8
9.14 + 6 = 20
10.11 + 5 = 6
11.17 + 9 = 8
12.12 - 2 = 10
13.20 + 2 = 22
14.15 + 5 = 20
15.18 + 6 = 24
16.10 + 7 = 17
17.20 - 8 = 12
18.17 + 10 = 27
19.17 + 9 = 26
20.14 + 6 = 20
21.17 + 6 = 23
22.17 + 2 = 19
23.13 + 7 = 6
24.19 + 6 = 25
25.16 + 10 = 26
26.13 + 7 = 20
27.16 + 3 = 19
28.16 + 5 = 21
29.15 + 4 = 11
30.18 + 10 = 28
31.10 + 9 = 19
32.12 + 8 = 20
33.15 - 0 = 15
34.11 + 6 = 17
35.12 + 9 = 21
36.17 + 9 = 8
37.10 + 6 = 16
38.14 + 10 = 24
39.15 + 2 = 17