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
1.19 - 6 - 5 = 8
2.6 - 0 = 6
3.0 - 0 - 0 = 0
4.19 + 1 = 20
5.6 + 7 + 8 = 21
6.18 + 9 = 27
7.11 - 10 - 9 = -8
8.0 + 4 + 8 = 12
9.8 + 0 = 8
10.2 - 1 = 1
11.17 + 6 = 23
12.5 + 2 - 0 = 7
13.3 - 1 = 2
14.1 + 6 - 8 = -1
15.5 - 4 = 1
16.8 + 8 + 6 = 22
17.15 - 4 = 19
18.2 + 1 + 6 = 9
19.14 + 9 = 23
20.1 + 0 - 7 = -6
21.5 - 3 - 0 = 2
22.15 + 3 = 18
23.17 - 11 - 7 = -1
24.0 + 4 - 1 = 3
25.1 - 0 - 0 = 1
26.5 - 0 = 5
27.6 + 1 - 4 = 3
28.5 - 2 = 3
29.0 + 6 - 0 = 6
30.5 + 2 = 7
31.13 + 6 = 19
32.2 + 3 = 5
33.1 + 7 - 7 = 1
34.12 - 5 = 17
35.7 - 5 = 2
36.18 - 0 - 0 = 18
37.15 + 7 = 22
38.9 + 9 + 5 = 23
39.6 - 1 = 5