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
1.19 - 7 - 3 = 9
2.4 + 0 - 2 = 2
3.1 - 0 - 0 = 1
4.0 + 6 - 4 = 2
5.8 + 1 = 9
6.0 - 0 = 0
7.3 + 5 - 3 = 5
8.9 - 1 = 8
9.6 - 0 = 6
10.3 - 2 = 1
11.5 + 1 = 6
12.4 + 4 - 7 = 1
13.5 - 1 - 0 = 4
14.0 - 0 = 0
15.0 + 6 - 5 = 1
16.0 + 6 - 5 = 1
17.12 + 7 = 19
18.8 + 0 - 1 = 7
19.15 - 2 - 0 = 13
20.0 + 7 - 3 = 4
21.19 - 3 - 0 = 16
22.9 + 0 - 7 = 2
23.8 + 5 + 7 = 20
24.16 + 3 = 19
25.7 + 0 = 7
26.5 + 8 - 3 = 10
27.12 + 4 = 16
28.1 - 0 = 1
29.18 + 6 = 12
30.15 + 3 = 18
31.3 - 2 = 1
32.9 + 0 - 2 = 7
33.4 + 4 + 8 = 16
34.0 - 0 - 0 = 0
35.8 + 3 + 6 = 17
36.13 + 5 = 18
37.5 + 1 - 2 = 4
38.8 + 7 - 8 = 7
39.6 - 5 = 1