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 + 7 + 6 = 15
2.8 + 6 - 6 = 8
3.9 - 1 = 8
4.20 + 2 = 22
5.4 + 0 - 1 = 3
6.13 - 3 = 10
7.2 + 5 + 7 = 14
8.3 + 4 = 7
9.3 + 1 - 4 = 0
10.10 + 4 = 14
11.4 + 0 = 4
12.4 + 5 - 3 = 6
13.5 + 5 + 1 = 11
14.8 + 1 = 9
15.5 + 9 + 3 = 17
16.5 + 2 - 2 = 5
17.19 + 1 = 20
18.6 + 5 + 6 = 17
19.18 - 8 = 10
20.3 + 5 - 2 = 6
21.13 + 1 = 14
22.6 + 0 - 2 = 4
23.8 + 3 + 5 = 16
24.6 + 5 + 3 = 14
25.0 - 0 = 0
26.20 - 7 = 13
27.2 + 4 = 6
28.7 + 8 + 1 = 16
29.7 + 2 = 9
30.11 + 4 = 7
31.9 - 0 - 0 = 9
32.13 + 4 = 17
33.4 + 3 - 2 = 5
34.18 + 6 = 24
35.5 + 0 - 5 = 0
36.0 - 0 - 0 = 0
37.10 + 8 = 18
38.9 + 4 + 0 = 13
39.5 + 5 - 5 = 5