19 加法 20 等于多少？
19 + 20 = 39
19加法20 等于 39
竖式演算
验算
- 用减法验算：39 − 20 = 19
- 用减法验算：39 − 19 = 20
相关题目
19 + 19 = 38
19 + 21 = 40
19 + 22 = 41
19 + 18 = 37
19 + 23 = 42
19 + 17 = 36
19 + 24 = 43
19 + 16 = 35
20 + 20 = 40
18 + 20 = 38
21 + 20 = 41
17 + 20 = 37
22 + 20 = 42
16 + 20 = 36
23 + 20 = 43
15 + 20 = 35
1 + 38 = 39
2 + 37 = 39
3 + 36 = 39
4 + 35 = 39
5 + 34 = 39
6 + 33 = 39
31 + 1 = 32
54 + 5 = 59
23 + 71 = 94
1 + 95 = 96
12 + 1 = 13
31 + 21 = 52
54 - 15 = 39
60 - 21 = 39