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
1.15 + 7 = 8
2.5 - 0 = 5
3.8 + 8 - 6 = 10
4.19 - 15 - 1 = 3
5.0 + 3 = 3
6.9 + 4 - 2 = 11
7.4 + 6 + 0 = 10
8.14 + 9 = 23
9.3 + 2 - 4 = 1
10.4 + 4 = 8
11.0 - 0 = 0
12.3 + 4 - 6 = 1
13.15 + 3 = 12
14.6 + 7 - 5 = 8
15.13 + 2 = 15
16.6 + 1 + 2 = 9
17.7 + 8 - 5 = 10
18.1 - 0 = 1
19.0 - 0 = 0
20.3 + 4 + 9 = 16
21.1 + 2 + 3 = 6
22.0 - 0 = 0
23.17 - 2 - 1 = 14
24.16 + 9 = 25
25.19 + 3 = 22
26.2 + 1 = 3
27.12 - 3 = 15
28.13 + 0 = 13
29.3 + 4 + 4 = 11
30.4 - 2 - 0 = 2
31.7 - 0 = 7
32.7 + 2 - 8 = 1
33.5 + 3 = 8
34.6 + 3 + 7 = 16
35.0 - 0 = 0
36.0 + 6 - 0 = 6
37.18 - 3 = 21
38.3 + 2 = 5
39.2 + 1 - 0 = 3