11~20的加减法+20以内加法（进位） 计算题
1.12 + 4 = 16
2.18 + 3 = 21
3.10 + 10 = 20
4.18 - 8 = 10
5.18 + 4 = 22
6.19 + 0 = 19
7.15 + 7 = 8
8.11 + 3 = 14
9.16 + 4 = 20
10.16 + 8 = 24
11.18 + 9 = 27
12.14 + 5 = 9
13.14 + 8 = 22
14.15 + 7 = 22
15.19 + 1 = 20
16.15 + 4 = 11
17.15 + 4 = 19
18.16 + 4 = 20
19.19 - 6 = 25
20.19 + 2 = 21
21.14 + 7 = 21
22.11 - 4 = 15
23.18 - 4 = 22
24.10 + 10 = 20
25.12 + 7 = 19
26.17 + 3 = 20
27.12 + 8 = 20
28.17 - 0 = 17
29.11 - 4 = 7
30.17 + 9 = 26
31.12 - 6 = 18
32.15 + 2 = 17
33.14 + 4 = 18
34.16 - 2 = 18
35.15 + 3 = 18
36.12 + 2 = 14
37.16 - 3 = 19
38.11 + 1 = 12
39.10 + 3 = 13