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 + 0 = 4
2.6 - 4 = 2
3.17 + 4 = 21
4.8 - 7 - 2 = -1
5.0 - 0 = 0
6.15 + 1 = 16
7.7 + 0 - 0 = 7
8.2 + 1 + 7 = 10
9.5 + 3 + 4 = 12
10.0 + 6 - 3 = 3
11.20 + 4 = 24
12.9 - 4 = 5
13.1 - 0 = 1
14.0 + 9 + 5 = 14
15.9 + 7 + 3 = 19
16.2 + 0 - 8 = -6
17.13 + 4 = 17
18.0 + 1 - 9 = -8
19.4 + 7 + 6 = 17
20.0 - 0 = 0
21.15 + 6 = 21
22.1 + 3 + 8 = 12
23.9 + 0 = 9
24.4 + 2 = 6
25.3 + 4 - 2 = 5
26.15 + 9 = 24
27.9 + 4 - 7 = 6
28.7 + 1 - 5 = 3
29.19 - 9 - 3 = 7
30.19 - 17 - 13 = -11
31.3 + 5 + 4 = 12
32.4 + 4 + 9 = 17
33.3 + 0 = 3
34.18 + 4 = 22
35.8 + 7 + 0 = 15
36.10 - 7 - 0 = 3
37.6 + 2 + 9 = 17
38.3 - 1 - 0 = 2
39.6 + 1 = 7