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 - 0 = 2
2.17 - 7 = 24
3.16 - 0 - 0 = 16
4.4 + 5 + 1 = 10
5.17 + 4 = 21
6.9 - 5 - 4 = 0
7.6 - 0 = 6
8.2 - 0 = 2
9.19 + 7 = 26
10.1 - 0 = 1
11.14 - 3 = 17
12.1 + 8 - 3 = 6
13.3 + 2 = 5
14.3 - 0 = 3
15.7 - 2 - 0 = 5
16.15 - 2 = 13
17.12 + 5 = 17
18.9 + 0 - 1 = 8
19.6 + 5 - 8 = 3
20.4 + 0 - 2 = 2
21.0 + 2 + 6 = 8
22.5 + 3 - 1 = 7
23.7 - 0 = 7
24.4 + 5 = 9
25.0 + 0 + 4 = 4
26.0 + 1 - 0 = 1
27.15 - 10 - 1 = 4
28.11 - 3 - 2 = 6
29.6 + 7 - 5 = 8
30.2 + 8 - 7 = 3
31.4 + 8 - 7 = 5
32.3 + 7 + 7 = 17
33.11 + 7 = 4
34.6 + 1 = 7
35.1 + 1 - 0 = 2
36.18 - 2 = 20
37.5 + 5 + 8 = 18
38.11 + 4 = 7
39.8 + 0 - 4 = 4