8 加法 9 等于多少？
8 + 9 = 17
8加法9 等于 17
竖式演算
验算
- 用减法验算：17 − 9 = 8
- 用减法验算：17 − 8 = 9
相关题目
8 + 8 = 16
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8 + 12 = 20
8 + 6 = 14
8 + 13 = 21
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10 + 9 = 19
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2 + 15 = 17
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