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
1.3 + 5 - 2 = 6
2.3 + 7 + 6 = 16
3.8 + 2 - 7 = 3
4.11 - 3 = 8
5.17 + 6 = 23
6.16 - 15 - 2 = -1
7.14 + 7 = 21
8.19 + 1 = 18
9.0 + 1 = 1
10.5 + 4 - 0 = 9
11.5 + 1 - 0 = 6
12.9 + 5 - 6 = 8
13.3 + 0 - 0 = 3
14.0 + 8 + 0 = 8
15.4 + 3 - 4 = 3
16.10 - 8 - 2 = 0
17.0 - 0 = 0
18.19 + 2 = 21
19.8 - 7 - 2 = -1
20.1 + 4 + 2 = 7
21.1 + 7 = 8
22.8 + 1 = 9
23.0 + 0 - 6 = -6
24.3 - 2 = 1
25.5 - 4 = 1
26.18 + 5 = 23
27.13 - 1 = 14
28.10 - 2 - 0 = 8
29.19 + 1 = 20
30.18 + 9 = 9
31.2 + 0 = 2
32.19 - 16 - 3 = 0
33.14 + 5 = 19
34.19 - 0 = 19
35.19 + 6 = 25
36.8 + 1 - 4 = 5
37.4 - 0 = 4
38.3 - 0 = 3
39.9 + 0 - 5 = 4