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 - 6 - 2 = 0
2.9 + 3 - 2 = 10
3.9 + 0 - 6 = 3
4.5 - 1 - 0 = 4
5.4 + 5 - 3 = 6
6.10 + 4 = 14
7.3 - 2 = 1
8.0 + 6 + 0 = 6
9.2 + 1 + 8 = 11
10.5 + 3 - 8 = 0
11.8 + 8 - 9 = 7
12.11 - 2 = 9
13.5 + 9 - 9 = 5
14.13 + 6 = 19
15.1 + 4 - 2 = 3
16.5 + 4 = 9
17.7 + 4 - 5 = 6
18.3 + 0 + 3 = 6
19.9 + 0 - 3 = 6
20.7 + 1 - 7 = 1
21.7 + 2 + 9 = 18
22.2 - 0 - 0 = 2
23.6 + 2 = 8
24.3 + 9 - 1 = 11
25.7 + 1 - 4 = 4
26.5 + 3 = 8
27.12 + 3 = 15
28.15 - 1 = 14
29.13 + 4 = 9
30.2 + 3 = 5
31.5 + 9 - 2 = 12
32.0 + 1 + 6 = 7
33.5 + 4 + 1 = 10
34.19 + 4 = 23
35.1 + 0 = 1
36.2 + 9 + 3 = 14
37.0 - 0 = 0
38.7 + 5 - 6 = 6
39.8 + 4 + 3 = 15