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
2.19 + 6 = 25
3.18 + 4 = 22
4.11 + 9 = 20
5.7 - 0 - 0 = 7
6.10 + 9 = 19
7.2 + 7 + 4 = 13
8.9 + 0 - 5 = 4
9.3 - 0 = 3
10.8 + 0 + 0 = 8
11.3 + 1 - 3 = 1
12.2 - 0 = 2
13.9 + 0 - 7 = 2
14.11 - 8 = 3
15.8 - 3 = 5
16.7 + 0 - 2 = 5
17.2 + 2 + 2 = 6
18.0 - 0 = 0
19.6 + 0 - 2 = 4
20.7 + 0 - 5 = 2
21.19 + 3 = 22
22.5 + 1 + 8 = 14
23.4 + 3 = 7
24.5 + 2 + 3 = 10
25.13 + 5 = 8
26.16 + 1 = 17
27.15 + 1 = 14
28.0 + 2 - 9 = -7
29.6 - 4 = 2
30.18 - 5 = 23
31.12 + 2 = 10
32.4 + 6 - 3 = 7
33.16 + 8 = 8
34.8 + 1 = 9
35.5 + 0 - 1 = 4
36.13 + 1 = 14
37.8 - 7 = 1
38.3 - 2 = 1
39.9 - 7 = 2