80 加法 9 等于多少？
80 + 9 = 89
80加法9 等于 89
竖式演算
验算
- 用减法验算：89 − 9 = 80
- 用减法验算：89 − 80 = 9
相关题目
80 + 8 = 88
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80 + 6 = 86
80 + 13 = 93
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81 + 9 = 90
78 + 9 = 87
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2 + 87 = 89
3 + 86 = 89
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27 + 71 = 98
34 + 1 = 35
32 + 55 = 87
51 + 16 = 67
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98 - 9 = 89