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
1.7 - 4 = 3
2.1 + 2 - 2 = 1
3.9 + 0 - 7 = 2
4.8 + 8 + 7 = 23
5.15 + 4 = 19
6.13 + 6 = 19
7.4 + 1 = 5
8.6 + 6 - 7 = 5
9.1 - 0 = 1
10.2 + 7 - 5 = 4
11.13 - 12 - 2 = -1
12.14 - 0 - 0 = 14
13.11 + 1 = 12
14.19 - 16 - 8 = -5
15.9 + 2 - 8 = 3
16.1 - 0 = 1
17.4 + 8 - 3 = 9
18.3 + 2 - 1 = 4
19.7 - 0 = 7
20.11 + 2 = 13
21.3 + 3 - 0 = 6
22.0 + 3 - 1 = 2
23.6 + 9 + 1 = 16
24.7 + 0 - 0 = 7
25.3 + 0 - 0 = 3
26.1 - 0 - 0 = 1
27.7 + 5 + 0 = 12
28.6 - 5 - 3 = -2
29.8 - 2 = 6
30.9 + 0 - 3 = 6
31.1 + 7 + 3 = 11
32.7 + 6 + 3 = 16
33.8 + 1 - 5 = 4
34.9 + 0 - 3 = 6
35.2 + 0 - 0 = 2
36.4 + 3 - 4 = 3
37.15 + 8 = 23
38.4 + 3 - 3 = 4
39.11 + 2 = 9