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
1.8 + 5 - 2 = 11
2.6 + 0 - 4 = 2
3.8 + 1 = 9
4.12 + 5 = 17
5.7 + 8 + 4 = 19
6.12 + 5 = 17
7.6 + 2 = 8
8.18 + 5 = 23
9.9 + 0 = 9
10.8 + 1 - 3 = 6
11.5 + 5 - 9 = 1
12.5 + 4 - 5 = 4
13.0 + 5 - 1 = 4
14.5 - 1 = 4
15.5 + 0 - 0 = 5
16.5 + 0 - 0 = 5
17.3 - 1 - 0 = 2
18.4 + 2 - 5 = 1
19.3 + 5 - 5 = 3
20.7 - 3 = 4
21.19 + 3 = 16
22.15 - 4 - 1 = 10
23.15 + 6 = 21
24.4 + 2 - 4 = 2
25.2 + 2 = 4
26.11 + 1 = 12
27.0 - 0 = 0
28.12 + 2 = 14
29.6 - 3 - 2 = 1
30.14 - 3 - 0 = 11
31.4 - 3 = 1
32.14 - 7 - 4 = 3
33.3 - 2 = 1
34.6 + 2 - 2 = 6
35.9 - 8 = 1
36.9 - 6 = 3
37.0 - 0 - 0 = 0
38.16 + 4 = 20
39.4 + 3 - 9 = -2