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
1.7 + 7 - 2 = 12
2.3 - 1 - 0 = 2
3.14 + 2 = 16
4.4 + 5 = 9
5.6 + 1 - 7 = 0
6.8 + 0 = 8
7.19 + 5 = 24
8.1 + 2 - 1 = 2
9.3 + 1 = 4
10.19 + 9 = 10
11.16 + 9 = 25
12.9 + 3 - 8 = 4
13.4 + 5 - 8 = 1
14.9 + 0 + 3 = 12
15.1 - 0 = 1
16.13 + 5 = 18
17.0 + 5 - 0 = 5
18.8 - 2 - 1 = 5
19.14 + 1 = 15
20.0 - 0 = 0
21.6 + 1 + 0 = 7
22.15 + 5 = 20
23.14 - 4 = 18
24.15 - 0 = 15
25.17 - 7 - 4 = 6
26.6 + 2 - 2 = 6
27.11 + 9 = 2
28.5 + 0 - 5 = 0
29.8 - 7 - 4 = -3
30.1 + 6 - 6 = 1
31.18 + 2 = 20
32.8 - 0 = 8
33.16 + 3 = 13
34.9 - 3 = 6
35.3 + 0 - 1 = 2
36.4 + 4 - 5 = 3
37.2 + 1 - 1 = 2
38.1 + 1 = 2
39.5 + 6 + 0 = 11