21 加法 56 等于多少？
21 + 56 = 77
21加法56 等于 77
竖式演算
验算
- 用减法验算：77 − 56 = 21
- 用减法验算：77 − 21 = 56
相关题目
21 + 55 = 76
21 + 57 = 78
21 + 58 = 79
21 + 54 = 75
21 + 59 = 80
21 + 53 = 74
21 + 60 = 81
21 + 52 = 73
20 + 56 = 76
22 + 56 = 78
19 + 56 = 75
23 + 56 = 79
24 + 56 = 80
18 + 56 = 74
25 + 56 = 81
17 + 56 = 73
1 + 76 = 77
2 + 75 = 77
3 + 74 = 77
4 + 73 = 77
5 + 72 = 77
6 + 71 = 77
20 + 65 = 85
64 + 35 = 99
70 + 16 = 86
90 + 3 = 93
21 + 100 = 121
20 + 50 = 70
80 - 3 = 77
77 × 1 = 77