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
1.8 + 8 - 3 = 13
2.9 - 1 = 8
3.9 + 0 = 9
4.15 + 8 = 23
5.0 + 9 = 9
6.9 + 0 - 5 = 4
7.3 + 0 - 1 = 2
8.8 + 8 + 1 = 17
9.4 + 1 = 5
10.4 + 2 + 9 = 15
11.8 + 0 - 1 = 7
12.13 + 2 = 15
13.4 - 2 = 2
14.3 + 8 - 0 = 11
15.8 + 1 - 5 = 4
16.15 + 2 = 17
17.6 + 8 - 1 = 13
18.6 + 4 + 9 = 19
19.1 - 0 - 0 = 1
20.9 + 3 - 9 = 3
21.4 + 2 = 6
22.1 + 2 - 2 = 1
23.5 - 1 = 4
24.19 + 3 = 22
25.9 - 0 = 9
26.9 + 4 + 7 = 20
27.1 + 8 - 1 = 8
28.8 + 4 + 7 = 19
29.3 - 2 = 1
30.19 - 7 = 26
31.3 + 5 = 8
32.0 + 4 - 5 = -1
33.12 + 1 = 13
34.4 + 2 = 6
35.10 - 6 - 3 = 1
36.15 - 3 - 0 = 12
37.2 + 6 = 8
38.6 + 3 - 5 = 4
39.16 - 8 - 2 = 6