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
15 + 42 = 57
88 + 10 = 98
45 + 12 = 57
24 + 15 = 39
15 + 64 = 79
71 + 13 = 84
82 - 5 = 77
84 - 7 = 77