1 加法 80 等于多少？
1 + 80 = 81
1加法80 等于 81
竖式演算
验算
- 用减法验算：81 − 80 = 1
- 用减法验算：81 − 1 = 80
相关题目
1 + 79 = 80
1 + 81 = 82
1 + 78 = 79
1 + 82 = 83
1 + 83 = 84
1 + 77 = 78
1 + 84 = 85
1 + 76 = 77
2 + 80 = 82
3 + 80 = 83
4 + 80 = 84
5 + 80 = 85
6 + 80 = 86
7 + 80 = 87
8 + 80 = 88
9 + 80 = 89
2 + 79 = 81
3 + 78 = 81
4 + 77 = 81
5 + 76 = 81
6 + 75 = 81
7 + 74 = 81
8 + 21 = 29
20 + 73 = 93
85 + 10 = 95
5 + 2 = 7
55 + 42 = 97
60 + 36 = 96
85 - 4 = 81
9 × 9 = 81