59 加法 21 等于多少？
59 + 21 = 80
59加法21 等于 80
竖式演算
验算
- 用减法验算：80 − 21 = 59
- 用减法验算：80 − 59 = 21
相关题目
59 + 20 = 79
59 + 22 = 81
59 + 19 = 78
59 + 23 = 82
59 + 24 = 83
59 + 18 = 77
59 + 25 = 84
59 + 17 = 76
58 + 21 = 79
60 + 21 = 81
57 + 21 = 78
61 + 21 = 82
56 + 21 = 77
62 + 21 = 83
55 + 21 = 76
63 + 21 = 84
1 + 79 = 80
2 + 78 = 80
3 + 77 = 80
4 + 76 = 80
5 + 75 = 80
6 + 74 = 80
21 + 49 = 70
67 + 92 = 159
64 + 64 = 128
30 + 88 = 118
61 + 68 = 129
95 + 24 = 119
81 - 1 = 80
100 - 20 = 80