20以内加法（进位） 计算题
1.12 + 9 = 21
2.15 + 1 = 16
3.14 + 5 = 19
4.11 + 7 = 18
5.18 + 7 = 25
6.16 + 8 = 24
7.14 + 9 = 23
8.10 + 2 = 12
9.12 + 6 = 18
10.19 + 5 = 24
11.18 + 4 = 22
12.13 + 7 = 20
13.12 + 9 = 21
14.14 + 2 = 16
15.19 + 3 = 22
16.13 + 7 = 20
17.12 + 5 = 17
18.12 + 3 = 15
19.11 + 9 = 20
20.12 + 6 = 18
21.13 + 10 = 23
22.13 + 7 = 20
23.18 + 7 = 25
24.17 + 1 = 18
25.13 + 5 = 18
26.14 + 2 = 16
27.19 + 10 = 29
28.10 + 2 = 12
29.13 + 10 = 23
30.16 + 7 = 23
31.17 + 8 = 25
32.17 + 6 = 23
33.16 + 3 = 19
34.11 + 3 = 14
35.18 + 5 = 23
36.18 + 4 = 22
37.15 + 3 = 18
38.11 + 4 = 15
39.13 + 5 = 18