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 - 3 - 2 = 2
2.0 + 2 + 7 = 9
3.19 + 8 = 11
4.7 + 2 - 9 = 0
5.9 + 3 - 0 = 12
6.1 + 4 - 1 = 4
7.8 - 0 = 8
8.11 + 6 = 17
9.6 - 4 = 2
10.3 - 2 - 1 = 0
11.6 + 0 = 6
12.3 + 0 - 2 = 1
13.5 + 4 - 0 = 9
14.8 - 2 - 1 = 5
15.8 + 0 + 3 = 11
16.1 + 1 = 2
17.0 + 5 - 0 = 5
18.13 + 3 = 16
19.14 - 2 - 0 = 12
20.1 + 0 + 8 = 9
21.0 + 3 - 9 = -6
22.7 + 0 = 7
23.14 - 12 - 0 = 2
24.0 + 0 = 0
25.9 + 0 - 1 = 8
26.12 + 0 = 12
27.6 + 0 = 6
28.8 - 2 = 6
29.9 + 0 = 9
30.3 - 1 = 2
31.1 + 6 = 7
32.17 - 12 - 2 = 3
33.15 + 6 = 9
34.9 + 0 = 9
35.15 + 7 = 8
36.5 + 1 - 4 = 2
37.1 + 8 - 0 = 9
38.7 - 5 = 2
39.19 - 2 = 17