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
1.9 + 5 - 8 = 6
2.4 + 4 - 0 = 8
3.1 + 4 + 8 = 13
4.2 + 2 + 2 = 6
5.1 + 8 - 0 = 9
6.7 + 8 + 2 = 17
7.9 - 0 = 9
8.2 - 0 = 2
9.8 + 1 - 6 = 3
10.1 + 5 + 5 = 11
11.6 + 1 - 6 = 1
12.13 + 3 = 16
13.18 - 2 = 20
14.2 - 1 = 1
15.4 + 6 + 1 = 11
16.0 + 0 - 1 = -1
17.17 - 0 = 17
18.2 + 3 = 5
19.15 - 3 = 12
20.3 + 0 - 1 = 2
21.18 + 7 = 25
22.10 + 3 = 13
23.1 + 2 - 1 = 2
24.4 + 5 - 3 = 6
25.4 + 9 + 5 = 18
26.7 + 2 = 9
27.8 + 0 - 0 = 8
28.19 - 7 = 26
29.5 - 3 = 2
30.18 + 5 = 23
31.5 + 6 + 9 = 20
32.13 + 8 = 21
33.11 + 8 = 3
34.2 + 4 + 9 = 15
35.13 + 7 = 6
36.9 + 0 = 9
37.9 + 0 - 5 = 4
38.2 + 8 - 6 = 4
39.0 + 1 - 7 = -6