2 加法 40 等于多少？
2 + 40 = 42
2加法40 等于 42
竖式演算
验算
- 用减法验算：42 − 40 = 2
- 用减法验算：42 − 2 = 40
相关题目
2 + 39 = 41
2 + 41 = 43
2 + 38 = 40
2 + 42 = 44
2 + 37 = 39
2 + 43 = 45
2 + 44 = 46
2 + 36 = 38
1 + 40 = 41
3 + 40 = 43
4 + 40 = 44
5 + 40 = 45
6 + 40 = 46
7 + 40 = 47
8 + 40 = 48
9 + 40 = 49
1 + 41 = 42
3 + 39 = 42
4 + 38 = 42
5 + 37 = 42
6 + 36 = 42
7 + 35 = 42
74 + 2 = 76
72 + 11 = 83
20 + 30 = 50
23 + 46 = 69
53 + 23 = 76
93 + 100 = 193
43 - 1 = 42
72 - 30 = 42