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
1.2 + 3 - 2 = 3
2.17 + 4 = 13
3.7 + 8 + 1 = 16
4.3 + 6 - 0 = 9
5.8 + 2 - 2 = 8
6.4 + 4 - 1 = 7
7.5 - 2 = 3
8.7 + 1 = 8
9.5 + 1 - 4 = 2
10.9 + 0 - 3 = 6
11.11 + 1 = 12
12.2 + 1 - 0 = 3
13.9 + 2 - 4 = 7
14.0 - 0 = 0
15.4 + 4 - 0 = 8
16.13 - 0 - 0 = 13
17.0 - 0 = 0
18.6 + 7 - 8 = 5
19.17 + 8 = 25
20.6 + 4 + 5 = 15
21.2 + 3 + 9 = 14
22.8 - 2 = 6
23.5 - 0 - 0 = 5
24.6 + 8 + 8 = 22
25.15 + 2 = 17
26.14 + 2 = 16
27.6 + 1 - 5 = 2
28.7 - 2 - 1 = 4
29.2 + 5 + 4 = 11
30.3 + 2 = 5
31.0 + 3 - 1 = 2
32.0 - 0 = 0
33.12 + 9 = 21
34.8 - 5 = 3
35.9 + 0 - 8 = 1
36.1 + 2 = 3
37.6 + 5 - 4 = 7
38.11 - 8 = 19
39.4 - 3 = 1