21 加法 40 等于多少？
21 + 40 = 61
21加法40 等于 61
竖式演算
验算
- 用减法验算：61 − 40 = 21
- 用减法验算：61 − 21 = 40
相关题目
21 + 39 = 60
21 + 41 = 62
21 + 38 = 59
21 + 42 = 63
21 + 37 = 58
21 + 43 = 64
21 + 44 = 65
21 + 36 = 57
20 + 40 = 60
22 + 40 = 62
19 + 40 = 59
23 + 40 = 63
24 + 40 = 64
18 + 40 = 58
25 + 40 = 65
17 + 40 = 57
1 + 60 = 61
2 + 59 = 61
3 + 58 = 61
4 + 57 = 61
5 + 56 = 61
6 + 55 = 61
33 + 61 = 94
53 + 13 = 66
1 + 54 = 55
30 + 60 = 90
43 + 46 = 89
43 + 25 = 68
88 - 27 = 61
68 - 7 = 61