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
2.5 - 0 = 5
3.4 + 4 - 4 = 4
4.2 - 1 = 1
5.4 + 2 - 1 = 5
6.6 + 1 - 1 = 6
7.4 + 4 + 1 = 9
8.6 + 3 = 9
9.19 + 3 = 22
10.9 + 0 - 5 = 4
11.10 + 10 = 20
12.8 - 7 = 1
13.1 + 7 + 6 = 14
14.2 - 1 = 1
15.5 + 3 = 8
16.3 + 6 - 2 = 7
17.12 + 2 = 14
18.5 + 2 - 4 = 3
19.14 + 6 = 8
20.8 - 6 - 3 = -1
21.5 + 1 - 0 = 6
22.2 + 2 - 2 = 2
23.4 + 3 - 1 = 6
24.4 - 0 = 4
25.0 + 9 - 4 = 5
26.20 - 5 = 25
27.5 + 6 + 8 = 19
28.16 + 8 = 8
29.11 + 4 = 7
30.17 - 10 - 4 = 3
31.9 + 8 - 2 = 15
32.2 + 3 - 9 = -4
33.3 - 2 - 0 = 1
34.9 - 6 = 3
35.3 - 1 = 2
36.3 - 1 = 2
37.4 - 0 = 4
38.3 + 6 - 5 = 4
39.15 - 12 - 10 = -7