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
1.9 + 2 - 4 = 7
2.3 + 1 = 4
3.19 - 7 = 12
4.11 - 8 - 4 = -1
5.1 + 9 - 6 = 4
6.10 + 4 = 14
7.13 + 5 = 8
8.16 - 6 = 10
9.11 + 8 = 19
10.4 + 0 - 0 = 4
11.5 + 0 - 5 = 0
12.0 + 7 - 1 = 6
13.6 + 2 - 5 = 3
14.1 + 0 - 0 = 1
15.13 - 10 - 8 = -5
16.5 - 4 - 2 = -1
17.2 + 3 - 2 = 3
18.7 + 0 - 5 = 2
19.9 + 0 - 2 = 7
20.7 + 2 = 9
21.2 - 0 = 2
22.1 - 0 - 0 = 1
23.5 + 7 - 1 = 11
24.5 + 3 + 3 = 11
25.6 + 1 - 9 = -2
26.2 - 0 = 2
27.1 + 7 = 8
28.11 - 1 - 0 = 10
29.7 + 8 + 7 = 22
30.16 + 8 = 8
31.8 + 3 - 3 = 8
32.1 + 1 = 2
33.19 + 6 = 25
34.18 + 3 = 21
35.7 - 5 = 2
36.2 + 4 - 2 = 4
37.3 + 4 - 5 = 2
38.2 + 8 - 1 = 9
39.16 - 3 = 13