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 + 1 = 9
2.10 + 10 = 20
3.2 + 0 - 4 = -2
4.11 + 8 = 19
5.4 + 9 + 1 = 14
6.16 + 7 = 23
7.5 + 3 - 0 = 8
8.0 + 8 - 0 = 8
9.0 + 0 - 2 = -2
10.14 + 6 = 20
11.6 + 7 - 4 = 9
12.0 + 7 + 0 = 7
13.18 - 0 = 18
14.14 - 5 - 2 = 7
15.1 + 3 - 0 = 4
16.17 + 7 = 24
17.4 - 3 = 1
18.5 - 2 = 3
19.0 + 7 = 7
20.14 + 10 = 24
21.19 + 4 = 15
22.8 + 8 - 1 = 15
23.5 + 9 - 3 = 11
24.1 + 1 + 8 = 10
25.1 - 0 = 1
26.3 + 4 - 3 = 4
27.3 - 0 = 3
28.2 - 1 = 1
29.12 - 0 - 0 = 12
30.17 - 4 - 2 = 11
31.6 + 0 - 0 = 6
32.8 + 0 - 4 = 4
33.0 + 7 = 7
34.18 + 6 = 24
35.8 + 1 - 7 = 2
36.2 + 0 - 0 = 2
37.1 + 4 = 5
38.3 + 9 - 4 = 8
39.7 + 1 = 8