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
1.4 + 3 = 7
2.0 + 3 - 6 = -3
3.8 + 3 - 4 = 7
4.8 - 0 - 0 = 8
5.9 + 0 = 9
6.9 + 0 = 9
7.19 + 6 = 25
8.7 - 4 - 2 = 1
9.5 - 1 = 4
10.3 + 6 - 2 = 7
11.0 + 6 + 8 = 14
12.20 - 8 = 28
13.13 + 4 = 17
14.11 + 6 = 17
15.3 + 6 + 6 = 15
16.1 + 2 - 1 = 2
17.4 + 3 + 8 = 15
18.0 + 2 - 0 = 2
19.5 - 4 = 1
20.8 + 0 - 2 = 6
21.7 + 2 = 9
22.20 - 5 = 15
23.7 + 6 - 8 = 5
24.2 - 1 = 1
25.7 - 5 - 1 = 1
26.2 + 1 = 3
27.15 - 4 - 3 = 8
28.1 + 8 = 9
29.5 + 4 = 9
30.7 + 2 + 3 = 12
31.11 - 8 = 3
32.12 + 1 = 13
33.0 + 0 - 0 = 0
34.8 + 1 - 0 = 9
35.17 - 8 = 25
36.15 + 3 = 12
37.6 + 8 + 3 = 17
38.3 + 3 + 3 = 9
39.16 + 2 = 18