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
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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
26 + 43 = 69
50 + 13 = 63
53 + 43 = 96
25 + 20 = 45
33 + 66 = 99
39 + 30 = 69
90 - 1 = 89
98 - 9 = 89