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
1.18 - 1 = 17
2.0 - 0 = 0
3.17 - 0 - 0 = 17
4.14 + 5 = 9
5.17 + 7 = 24
6.0 + 2 - 0 = 2
7.15 + 5 = 20
8.2 + 0 + 4 = 6
9.9 + 0 = 9
10.1 - 0 = 1
11.7 + 2 - 5 = 4
12.1 + 8 = 9
13.2 + 5 + 2 = 9
14.18 + 8 = 26
15.14 - 7 = 7
16.0 + 1 = 1
17.15 + 5 = 20
18.15 + 5 = 10
19.12 + 6 = 18
20.6 - 0 = 6
21.12 - 11 - 0 = 1
22.6 + 7 - 6 = 7
23.8 + 0 = 8
24.4 + 9 - 7 = 6
25.16 + 5 = 21
26.9 + 0 - 0 = 9
27.5 + 2 + 7 = 14
28.7 + 0 = 7
29.8 - 7 = 1
30.15 - 3 - 2 = 10
31.19 + 0 = 19
32.0 - 0 - 0 = 0
33.8 - 6 - 2 = 0
34.19 + 6 = 13
35.7 - 3 = 4
36.8 - 7 - 4 = -3
37.1 + 1 - 0 = 2
38.0 - 0 = 0
39.3 + 1 - 7 = -3