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
1.6 + 1 - 8 = -1
2.15 - 1 = 16
3.4 + 2 = 6
4.9 + 0 = 9
5.5 + 2 - 1 = 6
6.8 - 5 = 3
7.7 + 9 + 7 = 23
8.9 + 0 - 7 = 2
9.13 - 1 - 0 = 12
10.15 - 4 = 19
11.8 - 6 - 4 = -2
12.15 - 8 = 23
13.6 + 7 + 5 = 18
14.16 + 10 = 26
15.8 + 8 - 5 = 11
16.19 + 7 = 26
17.2 + 1 = 3
18.1 + 2 + 6 = 9
19.11 + 3 = 14
20.11 - 9 - 6 = -4
21.15 + 7 = 8
22.9 - 3 = 6
23.10 - 7 - 6 = -3
24.1 - 0 = 1
25.18 + 3 = 21
26.2 + 8 + 8 = 18
27.13 - 0 = 13
28.4 + 4 - 9 = -1
29.10 - 9 - 3 = -2
30.1 + 4 - 0 = 5
31.0 + 5 + 4 = 9
32.20 + 5 = 15
33.15 - 2 - 1 = 12
34.4 + 3 - 2 = 5
35.4 + 5 + 7 = 16
36.19 - 7 - 6 = 6
37.2 + 0 - 1 = 1
38.0 + 2 - 0 = 2
39.0 - 0 = 0