55 加法 21 等于多少？
55 + 21 = 76
55加法21 等于 76
竖式演算
验算
- 用减法验算：76 − 21 = 55
- 用减法验算：76 − 55 = 21
相关题目
55 + 20 = 75
55 + 22 = 77
55 + 19 = 74
55 + 23 = 78
55 + 24 = 79
55 + 18 = 73
55 + 25 = 80
55 + 17 = 72
56 + 21 = 77
54 + 21 = 75
57 + 21 = 78
53 + 21 = 74
58 + 21 = 79
52 + 21 = 73
59 + 21 = 80
51 + 21 = 72
1 + 75 = 76
2 + 74 = 76
3 + 73 = 76
4 + 72 = 76
5 + 71 = 76
6 + 70 = 76
100 + 78 = 178
13 + 36 = 49
26 + 3 = 29
13 + 34 = 47
50 + 36 = 86
28 + 71 = 99
78 - 2 = 76
81 - 5 = 76