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
1.6 - 4 - 2 = 0
2.11 + 5 = 6
3.7 + 1 - 2 = 6
4.0 - 0 = 0
5.20 - 0 = 20
6.2 + 4 - 0 = 6
7.6 + 6 + 3 = 15
8.9 - 2 - 0 = 7
9.17 + 4 = 13
10.4 + 2 - 4 = 2
11.1 + 6 - 0 = 7
12.4 + 0 = 4
13.4 + 7 + 4 = 15
14.3 - 1 = 2
15.8 - 5 - 4 = -1
16.2 - 0 = 2
17.1 + 8 - 8 = 1
18.10 - 9 - 8 = -7
19.3 + 9 - 4 = 8
20.5 + 3 - 4 = 4
21.2 + 1 - 5 = -2
22.0 + 2 + 4 = 6
23.17 - 2 = 15
24.9 + 0 = 9
25.0 + 2 + 2 = 4
26.17 - 8 = 9
27.6 + 0 - 3 = 3
28.11 - 1 = 10
29.0 + 4 = 4
30.6 + 3 - 7 = 2
31.11 - 3 = 8
32.18 - 9 = 27
33.5 - 1 = 4
34.6 - 4 = 2
35.12 - 9 - 2 = 1
36.3 - 1 = 2
37.14 - 2 = 12
38.4 - 3 = 1
39.15 + 8 = 23