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
1.1 + 1 = 2
2.6 + 2 - 4 = 4
3.1 + 7 - 5 = 3
4.16 + 8 = 8
5.15 + 2 = 17
6.15 - 3 - 2 = 10
7.8 + 1 - 3 = 6
8.7 + 3 - 3 = 7
9.4 + 1 = 5
10.10 - 0 - 0 = 10
11.7 + 1 + 7 = 15
12.5 + 4 - 3 = 6
13.7 + 9 - 9 = 7
14.6 + 2 - 2 = 6
15.4 - 2 = 2
16.8 + 0 = 8
17.13 + 5 = 18
18.2 - 1 = 1
19.9 + 0 = 9
20.15 + 8 = 23
21.1 + 1 + 0 = 2
22.13 - 1 = 14
23.11 + 4 = 15
24.4 - 0 - 0 = 4
25.8 + 8 - 8 = 8
26.11 - 0 = 11
27.15 + 9 = 24
28.19 + 3 = 22
29.4 + 1 + 9 = 14
30.4 + 2 = 6
31.0 + 7 - 4 = 3
32.5 + 0 - 4 = 1
33.2 + 1 = 3
34.16 - 2 = 14
35.20 + 9 = 11
36.19 + 5 = 24
37.13 - 6 - 3 = 4
38.9 + 0 - 4 = 5
39.7 + 0 = 7