21 加法 59 等于多少？
21 + 59 = 80
21加法59 等于 80
竖式演算
验算
- 用减法验算：80 − 59 = 21
- 用减法验算：80 − 21 = 59
相关题目
21 + 58 = 79
21 + 60 = 81
21 + 57 = 78
21 + 61 = 82
21 + 56 = 77
21 + 62 = 83
21 + 55 = 76
21 + 63 = 84
20 + 59 = 79
22 + 59 = 81
19 + 59 = 78
23 + 59 = 82
24 + 59 = 83
18 + 59 = 77
25 + 59 = 84
17 + 59 = 76
1 + 79 = 80
2 + 78 = 80
3 + 77 = 80
4 + 76 = 80
5 + 75 = 80
6 + 74 = 80
41 + 91 = 132
75 + 6 = 81
47 + 8 = 55
33 + 28 = 61
41 + 87 = 128
29 + 62 = 91
97 - 17 = 80
2 × 40 = 80