9 加法 80 等于多少？
9 + 80 = 89
9加法80 等于 89
竖式演算
验算
- 用减法验算：89 − 80 = 9
- 用减法验算：89 − 9 = 80
相关题目
9 + 79 = 88
9 + 81 = 90
9 + 78 = 87
9 + 82 = 91
9 + 83 = 92
9 + 77 = 86
9 + 84 = 93
9 + 76 = 85
8 + 80 = 88
10 + 80 = 90
11 + 80 = 91
7 + 80 = 87
12 + 80 = 92
6 + 80 = 86
13 + 80 = 93
5 + 80 = 85
1 + 88 = 89
2 + 87 = 89
3 + 86 = 89
4 + 85 = 89
5 + 84 = 89
6 + 83 = 89
22 + 20 = 42
7 + 100 = 107
19 + 60 = 79
11 + 10 = 21
100 + 1 = 101
71 + 100 = 171
90 - 1 = 89
91 - 2 = 89