10以内的加法+10以内的减法+10以内的加减混合+10以内连加+10以内连减+10以内加减混合+11~20的加减法+20以内加法（进位） 计算题
1.19 - 1 = 18
2.3 - 2 = 1
3.9 + 0 + 3 = 12
4.4 - 0 = 4
5.1 - 0 = 1
6.0 - 0 = 0
7.4 - 3 - 2 = -1
8.2 + 6 - 3 = 5
9.1 + 1 - 0 = 2
10.13 - 7 = 6
11.12 + 10 = 22
12.12 + 10 = 22
13.8 + 0 - 7 = 1
14.11 + 5 = 16
15.10 + 6 = 16
16.12 + 5 = 17
17.3 - 1 = 2
18.12 - 1 = 11
19.17 + 1 = 18
20.16 - 0 = 16
21.9 + 0 = 9
22.8 + 9 - 7 = 10
23.8 + 9 - 6 = 11
24.6 + 2 = 8
25.12 + 4 = 8
26.13 + 8 = 21
27.10 + 5 = 15
28.9 + 0 - 3 = 6
29.17 - 4 = 13
30.19 + 10 = 29
31.0 + 2 = 2
32.5 - 2 = 3
33.17 + 6 = 23
34.3 + 4 = 7
35.18 - 8 = 26
36.8 - 7 - 1 = 0
37.6 + 0 - 3 = 3
38.1 - 0 = 1
39.12 - 7 - 3 = 2