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 - 2 - 1 = 3
2.0 - 0 - 0 = 0
3.11 + 4 = 15
4.3 + 6 - 1 = 8
5.1 - 0 - 0 = 1
6.7 - 0 = 7
7.7 - 6 = 1
8.9 + 9 + 1 = 19
9.7 + 1 - 0 = 8
10.9 + 0 - 3 = 6
11.5 + 2 - 3 = 4
12.0 + 8 - 0 = 8
13.5 + 1 = 6
14.9 + 0 + 1 = 10
15.6 - 4 - 2 = 0
16.1 + 0 = 1
17.4 + 5 - 3 = 6
18.1 + 7 + 0 = 8
19.1 - 0 - 0 = 1
20.19 - 9 - 3 = 7
21.1 - 0 = 1
22.20 + 6 = 26
23.9 + 0 = 9
24.9 + 0 = 9
25.4 - 3 = 1
26.11 + 9 = 2
27.16 + 8 = 8
28.8 + 7 + 2 = 17
29.2 + 7 = 9
30.4 + 3 = 7
31.3 + 4 + 9 = 16
32.9 - 2 = 7
33.9 - 1 - 0 = 8
34.12 + 1 = 13
35.8 + 0 = 8
36.0 + 1 - 0 = 1
37.0 + 3 = 3
38.16 + 3 = 19
39.8 + 1 - 3 = 6