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
1.18 + 6 = 24
2.3 - 1 = 2
3.5 + 1 = 6
4.6 - 2 = 4
5.0 + 3 - 2 = 1
6.8 + 5 + 9 = 22
7.6 + 3 - 3 = 6
8.4 + 3 + 5 = 12
9.4 + 7 - 4 = 7
10.9 + 0 = 9
11.6 + 2 - 6 = 2
12.17 - 3 - 0 = 14
13.9 + 0 = 9
14.13 - 8 = 5
15.9 + 8 - 6 = 11
16.8 + 3 - 0 = 11
17.5 + 3 + 1 = 9
18.6 - 3 = 3
19.6 - 0 - 0 = 6
20.7 + 2 = 9
21.19 + 6 = 13
22.2 + 2 - 3 = 1
23.12 - 2 - 0 = 10
24.9 + 9 - 4 = 14
25.9 + 1 + 1 = 11
26.2 + 7 = 9
27.12 - 2 - 0 = 10
28.4 + 6 + 1 = 11
29.1 + 9 + 6 = 16
30.8 + 1 - 2 = 7
31.8 - 7 = 1
32.9 - 7 - 0 = 2
33.7 + 4 + 3 = 14
34.13 + 5 = 18
35.1 + 3 + 0 = 4
36.10 + 8 = 18
37.1 + 8 - 5 = 4
38.6 + 1 + 6 = 13
39.9 - 2 = 7