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
1.2 + 2 - 2 = 2
2.15 + 10 = 25
3.19 - 5 - 2 = 12
4.4 + 6 - 5 = 5
5.7 + 0 = 7
6.0 + 3 - 2 = 1
7.15 + 2 = 17
8.6 + 2 = 8
9.18 + 5 = 23
10.0 - 0 = 0
11.3 + 3 + 6 = 12
12.2 + 7 - 0 = 9
13.1 + 5 = 6
14.2 + 2 + 8 = 12
15.4 + 0 - 0 = 4
16.15 + 2 = 13
17.9 + 0 = 9
18.8 - 2 = 6
19.13 + 1 = 14
20.11 + 4 = 15
21.7 - 1 = 6
22.1 + 3 - 1 = 3
23.2 + 8 - 9 = 1
24.19 - 8 = 27
25.0 + 7 - 4 = 3
26.3 - 0 = 3
27.19 - 5 - 4 = 10
28.7 - 3 = 4
29.5 + 2 - 0 = 7
30.7 + 0 = 7
31.14 + 1 = 15
32.6 + 0 = 6
33.18 + 9 = 27
34.1 + 6 = 7
35.2 + 0 - 0 = 2
36.3 + 4 - 3 = 4
37.20 + 6 = 26
38.7 + 0 - 6 = 1
39.12 + 4 = 16