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 - 8 = 27
2.18 + 8 = 26
3.15 - 14 - 2 = -1
4.8 + 1 = 9
5.9 + 3 - 9 = 3
6.0 + 0 + 7 = 7
7.9 + 7 + 5 = 21
8.1 - 0 - 0 = 1
9.3 + 4 = 7
10.2 + 4 + 4 = 10
11.0 + 7 = 7
12.3 - 0 = 3
13.6 + 0 - 3 = 3
14.4 + 3 - 0 = 7
15.8 - 5 - 2 = 1
16.18 - 9 - 8 = 1
17.6 + 1 - 1 = 6
18.9 + 0 = 9
19.7 + 1 + 1 = 9
20.3 + 4 - 9 = -2
21.9 + 0 - 3 = 6
22.6 + 3 - 9 = 0
23.2 - 1 = 1
24.16 - 7 = 9
25.15 + 6 = 21
26.7 - 3 = 4
27.0 + 9 - 1 = 8
28.5 + 0 = 5
29.7 + 2 - 6 = 3
30.0 + 2 - 0 = 2
31.8 + 0 = 8
32.5 - 1 - 0 = 4
33.0 + 4 + 9 = 13
34.3 + 1 = 4
35.17 + 7 = 24
36.5 - 2 - 1 = 2
37.5 + 4 + 3 = 12
38.14 - 3 = 17
39.1 + 4 + 1 = 6