20以内加法（进位） 计算题
1.13 + 4 = 17
2.15 + 8 = 23
3.19 + 2 = 21
4.16 + 5 = 21
5.17 + 1 = 18
6.15 + 4 = 19
7.19 + 7 = 26
8.17 + 1 = 18
9.12 + 9 = 21
10.11 + 10 = 21
11.18 + 9 = 27
12.14 + 8 = 22
13.18 + 9 = 27
14.15 + 6 = 21
15.19 + 1 = 20
16.15 + 2 = 17
17.18 + 9 = 27
18.14 + 6 = 20
19.19 + 7 = 26
20.19 + 6 = 25
21.13 + 10 = 23
22.16 + 7 = 23
23.15 + 1 = 16
24.15 + 8 = 23
25.12 + 6 = 18
26.15 + 9 = 24
27.19 + 7 = 26
28.18 + 6 = 24
29.16 + 1 = 17
30.19 + 3 = 22
31.13 + 5 = 18
32.13 + 2 = 15
33.12 + 1 = 13
34.12 + 9 = 21
35.15 + 5 = 20
36.16 + 8 = 24
37.15 + 3 = 18
38.11 + 10 = 21
39.12 + 5 = 17