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 + 2 - 4 = 5
2.19 + 5 = 24
3.17 + 8 = 25
4.6 - 0 = 6
5.0 + 4 - 3 = 1
6.0 - 0 = 0
7.9 + 6 + 6 = 21
8.17 + 10 = 27
9.7 + 3 - 2 = 8
10.2 + 4 - 1 = 5
11.15 + 8 = 23
12.10 + 10 = 20
13.6 - 1 - 0 = 5
14.4 - 3 = 1
15.5 + 2 - 0 = 7
16.8 + 8 + 7 = 23
17.4 + 3 = 7
18.2 + 9 + 2 = 13
19.4 + 5 + 0 = 9
20.16 + 6 = 22
21.8 + 1 = 9
22.13 + 8 = 21
23.5 - 3 - 0 = 2
24.8 - 3 - 0 = 5
25.0 + 5 + 0 = 5
26.5 + 4 + 9 = 18
27.2 + 9 - 9 = 2
28.5 + 2 - 4 = 3
29.4 - 3 = 1
30.11 - 6 = 17
31.7 + 2 - 1 = 8
32.19 + 0 = 19
33.7 + 7 + 1 = 15
34.2 + 1 - 2 = 1
35.2 + 1 - 0 = 3
36.3 + 5 - 1 = 7
37.11 + 2 = 13
38.4 - 0 = 4
39.17 + 1 = 16