21 加法 57 等于多少？
21 + 57 = 78
21加法57 等于 78
竖式演算
验算
- 用减法验算：78 − 57 = 21
- 用减法验算：78 − 21 = 57
相关题目
21 + 56 = 77
21 + 58 = 79
21 + 55 = 76
21 + 59 = 80
21 + 60 = 81
21 + 54 = 75
21 + 61 = 82
21 + 53 = 74
20 + 57 = 77
22 + 57 = 79
19 + 57 = 76
23 + 57 = 80
24 + 57 = 81
18 + 57 = 75
25 + 57 = 82
17 + 57 = 74
1 + 77 = 78
2 + 76 = 78
3 + 75 = 78
4 + 74 = 78
5 + 73 = 78
6 + 72 = 78
40 + 1 = 41
27 + 30 = 57
47 + 11 = 58
62 + 31 = 93
40 + 14 = 54
40 + 12 = 52
95 - 17 = 78
98 - 20 = 78