20 加法 20 等于多少？
20 + 20 = 40
20加法20 等于 40
竖式演算
验算
- 用减法验算：40 − 20 = 20
- 用减法验算：40 − 20 = 20
相关题目
20 + 19 = 39
20 + 21 = 41
20 + 22 = 42
20 + 18 = 38
20 + 23 = 43
20 + 17 = 37
20 + 24 = 44
20 + 16 = 36
19 + 20 = 39
21 + 20 = 41
22 + 20 = 42
18 + 20 = 38
23 + 20 = 43
17 + 20 = 37
24 + 20 = 44
16 + 20 = 36
1 + 39 = 40
2 + 38 = 40
3 + 37 = 40
4 + 36 = 40
5 + 35 = 40
6 + 34 = 40
24 + 5 = 29
6 + 42 = 48
34 + 54 = 88
15 + 82 = 97
100 + 96 = 196
60 + 32 = 92
61 - 21 = 40
93 - 53 = 40