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
1.5 + 0 - 4 = 1
2.2 + 1 - 1 = 2
3.16 + 4 = 12
4.18 + 7 = 25
5.3 - 1 - 0 = 2
6.3 + 8 + 1 = 12
7.7 + 1 + 7 = 15
8.11 + 6 = 17
9.15 - 4 = 11
10.12 + 3 = 15
11.17 + 2 = 19
12.4 - 0 = 4
13.8 + 0 - 4 = 4
14.13 + 8 = 21
15.7 - 0 = 7
16.5 + 7 + 9 = 21
17.1 + 5 - 3 = 3
18.15 - 8 = 23
19.9 - 3 = 6
20.7 + 6 - 6 = 7
21.4 + 2 = 6
22.7 - 3 = 4
23.20 - 2 = 22
24.6 + 1 = 7
25.4 - 0 - 0 = 4
26.8 + 8 + 2 = 18
27.6 - 4 = 2
28.3 + 2 - 2 = 3
29.16 + 2 = 14
30.8 + 1 = 9
31.11 - 0 = 11
32.11 - 6 - 1 = 4
33.11 + 10 = 21
34.2 + 4 - 2 = 4
35.13 + 7 = 20
36.5 + 8 - 7 = 6
37.0 + 8 - 4 = 4
38.6 + 5 + 2 = 13
39.3 + 6 - 7 = 2