11~20的加减法+20以内加法（进位） 计算题
1.20 + 4 = 16
2.11 + 5 = 16
3.11 - 1 = 12
4.15 + 3 = 18
5.10 + 1 = 11
6.16 + 5 = 21
7.11 - 3 = 8
8.11 + 2 = 13
9.12 + 1 = 11
10.10 + 1 = 11
11.18 + 8 = 26
12.13 - 6 = 7
13.10 + 3 = 13
14.20 + 1 = 21
15.20 - 8 = 28
16.17 + 3 = 20
17.11 + 10 = 21
18.17 + 6 = 23
19.16 + 3 = 19
20.17 + 5 = 22
21.15 + 4 = 19
22.14 + 0 = 14
23.12 + 5 = 17
24.20 + 6 = 26
25.11 + 9 = 20
26.12 - 1 = 11
27.16 - 7 = 9
28.12 - 8 = 20
29.18 + 2 = 20
30.19 - 0 = 19
31.13 + 1 = 12
32.18 + 7 = 25
33.14 + 7 = 21
34.19 + 9 = 10
35.12 + 9 = 21
36.18 + 6 = 24
37.17 + 1 = 18
38.16 - 2 = 18
39.19 - 3 = 22