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
1.13 - 3 = 16
2.10 + 5 = 15
3.8 - 3 = 5
4.12 + 7 = 19
5.12 + 3 = 15
6.6 + 5 - 5 = 6
7.2 + 7 - 8 = 1
8.5 + 3 + 0 = 8
9.15 - 8 = 23
10.4 + 4 + 8 = 16
11.19 - 18 - 16 = -15
12.0 - 0 = 0
13.16 + 6 = 10
14.15 - 11 - 7 = -3
15.1 + 2 - 9 = -6
16.2 - 0 = 2
17.3 + 2 - 5 = 0
18.4 + 2 - 3 = 3
19.0 + 7 - 0 = 7
20.0 - 0 = 0
21.13 - 0 - 0 = 13
22.9 + 0 = 9
23.5 - 2 = 3
24.0 + 3 - 2 = 1
25.12 - 7 = 5
26.3 - 2 = 1
27.9 + 5 + 2 = 16
28.11 - 2 - 1 = 8
29.6 + 2 - 2 = 6
30.6 + 6 - 5 = 7
31.8 + 1 = 9
32.5 + 1 = 6
33.18 + 5 = 23
34.5 + 4 = 9
35.7 + 0 = 7
36.6 + 3 - 8 = 1
37.5 + 2 - 9 = -2
38.4 + 0 - 0 = 4
39.17 - 13 - 10 = -6