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
1.3 - 2 = 1
2.13 + 6 = 19
3.5 + 0 - 4 = 1
4.4 + 4 + 5 = 13
5.11 + 3 = 14
6.3 + 2 - 0 = 5
7.2 + 8 - 9 = 1
8.1 + 5 - 0 = 6
9.8 - 4 - 3 = 1
10.9 - 0 = 9
11.18 + 10 = 28
12.20 + 1 = 21
13.6 + 2 - 4 = 4
14.3 + 1 - 3 = 1
15.4 + 0 + 0 = 4
16.7 + 1 - 4 = 4
17.4 + 2 - 0 = 6
18.17 + 5 = 22
19.3 + 1 = 4
20.7 - 5 - 0 = 2
21.14 + 5 = 19
22.2 + 7 = 9
23.6 - 0 = 6
24.16 + 7 = 23
25.7 + 0 - 3 = 4
26.9 + 0 = 9
27.1 + 0 = 1
28.1 + 4 - 1 = 4
29.8 + 4 - 7 = 5
30.4 + 5 = 9
31.8 - 7 - 0 = 1
32.4 + 5 - 2 = 7
33.16 - 10 - 4 = 2
34.9 - 4 = 5
35.6 + 3 - 8 = 1
36.13 - 5 = 18
37.12 - 9 - 2 = 1
38.11 + 0 = 11
39.7 + 3 - 7 = 3