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
1.11 + 5 = 16
2.13 + 3 = 16
3.6 + 3 = 9
4.19 - 1 = 18
5.7 + 2 = 9
6.6 + 2 - 1 = 7
7.0 + 9 = 9
8.18 + 7 = 25
9.20 - 5 = 25
10.8 + 8 + 3 = 19
11.15 + 4 = 19
12.12 - 3 = 9
13.19 + 4 = 15
14.9 + 1 + 0 = 10
15.9 + 7 + 0 = 16
16.8 - 2 = 6
17.9 + 0 = 9
18.2 + 1 - 1 = 2
19.6 + 8 + 9 = 23
20.15 + 10 = 25
21.0 - 0 - 0 = 0
22.1 - 0 = 1
23.1 + 8 + 8 = 17
24.15 + 8 = 23
25.19 + 9 = 28
26.12 - 11 - 10 = -9
27.0 + 5 + 3 = 8
28.20 + 2 = 18
29.6 + 2 - 8 = 0
30.4 - 0 = 4
31.0 + 2 - 0 = 2
32.4 + 6 + 3 = 13
33.1 + 2 - 2 = 1
34.8 + 1 = 9
35.4 + 0 = 4
36.9 + 0 - 1 = 8
37.19 + 4 = 15
38.13 - 8 = 21
39.2 + 7 + 3 = 12